DOC: Update development documentation urls
In #26648 we started building the documentation in https://dev.pandas.io . Updated the links to the development documentation to point to the new url.
and the README.md? # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=h1) Report
> Merging [#26857](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/430f0fd04646a0ab44ccbfbad706dfe22e9fabfe?src=pr&el=desc) will **decrease** coverage by `50.79%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/26857/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #26857      +/-   ##
==========================================
- Coverage   91.88%   41.09%   -50.8%     
==========================================
  Files         179      179              
  Lines       50696    50696              
==========================================
- Hits        46581    20832   -25749     
- Misses       4115    29864   +25749
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `?` | |
| #single | `41.09% <ø> (-0.09%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/formats/latex.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvbGF0ZXgucHk=) | `0% <0%> (-100%)` | :arrow_down: |
| [pandas/plotting/\_matplotlib/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19tYXRwbG90bGliL19faW5pdF9fLnB5) | `0% <0%> (-100%)` | :arrow_down: |
| [pandas/io/gcs.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2djcy5weQ==) | `0% <0%> (-100%)` | :arrow_down: |
| [pandas/io/sas/sas\_constants.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL3Nhcy9zYXNfY29uc3RhbnRzLnB5) | `0% <0%> (-100%)` | :arrow_down: |
| [pandas/core/groupby/categorical.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZ3JvdXBieS9jYXRlZ29yaWNhbC5weQ==) | `0% <0%> (-100%)` | :arrow_down: |
| [pandas/tseries/plotting.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL3RzZXJpZXMvcGxvdHRpbmcucHk=) | `0% <0%> (-100%)` | :arrow_down: |
| [pandas/io/s3.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL3MzLnB5) | `0% <0%> (-100%)` | :arrow_down: |
| [pandas/io/formats/html.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2Zvcm1hdHMvaHRtbC5weQ==) | `0% <0%> (-99.37%)` | :arrow_down: |
| [pandas/io/sas/sas7bdat.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL3Nhcy9zYXM3YmRhdC5weQ==) | `0% <0%> (-91.16%)` | :arrow_down: |
| [pandas/io/sas/sas\_xport.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL3Nhcy9zYXNfeHBvcnQucHk=) | `0% <0%> (-90.1%)` | :arrow_down: |
| ... and [132 more](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=footer). Last update [430f0fd...363e5b6](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=h1) Report
> Merging [#26857](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/a890caf47e797c853b790b468b33de90134514bd?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/26857/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #26857      +/-   ##
==========================================
- Coverage   91.86%   91.86%   -0.01%     
==========================================
  Files         180      180              
  Lines       50712    50712              
==========================================
- Hits        46589    46586       -3     
- Misses       4123     4126       +3
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.45% <ø> (ø)` | :arrow_up: |
| #single | `41.12% <ø> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `88.88% <0%> (-11.12%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `96.88% <0%> (-0.12%)` | :arrow_down: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/26857/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `90.94% <0%> (+0.1%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=footer). Last update [a890caf...aaa9809](https://codecov.io/gh/pandas-dev/pandas/pull/26857?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 good point, updated, thanks @simonjayhawkins  how is  the domain permissioned? Not sure what you mean, Wes configured the dns setting, and we set up it in github with a file name `CNAME` when we push to the github pages repo. The https is set up automatically by github (they generated a certificate for us, that took longer than expected but it's been working for couple of days). can the prior site redirect to this new one? Not setting up the dns, I'd say what we could do is replace every html in that site for a page with an http/javascript redirect.

I wouldn't bother being the dev site, there shouldn't be important links I guess. But I may be missing something. discussed with @jorisvandenbossche, and we don't think it's worth bothering on building something to create redirects from the travis dev docs to the new dev docs.

If that's all right I'll simply add a note and a link in the home page of the old dev docs, in case anyone is not aware of the change. But we need to merge #26856 first, or travis will overwrite the note. Agreed it's not worth redirecting.

On Tue, Jun 18, 2019 at 7:04 AM Marc Garcia <notifications@github.com>
wrote:

> discussed with @jorisvandenbossche <https://github.com/jorisvandenbossche>,
> and we don't think it's worth bothering on building something to create
> redirects from the travis dev docs to the new dev docs.
>
> If that's all right I'll simply add a note and a link in the home page of
> the old dev docs, in case anyone is not aware of the change. But we need to
> merge #26856 <https://github.com/pandas-dev/pandas/pull/26856> first, or
> travis will overwrite the note.
>
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 yeah its fine not to redirect (in the docs themselves, but maybe just a message on the site would be fine with the new uri (e.g. a 1-time update)

so @datapythonista suggestion seems fine. Agree, I'll do that once #26856 is merged (we will overwrite the message with the new url from the travis build if we don't stop it first). I opened https://github.com/pandas-docs/pandas-docs-travis/pull/3 with the redirect message, I don't have write permissions to that repo. Does anyone have them? Otherwise, @jorisvandenbossche I think you've got the github token to push to that repo, don't you? @jreback does this PR looks good? Probably worth merging soon, since we stopped the travis build now, and the urls are wrong. thanks @datapythonista 