add `ntv-pandas` to the ecosystem 
As defined in the conclusion of the [PDEP-12](https://pandas.pydata.org/pdeps/0012-compact-and-reversible-JSON-interface.html), add `ntv-pandas` to the ecosystem .

- [ ] closes #xxxx (Replace xxxx with the GitHub issue number)
- [ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

Thanks @loco-philippe  Thanks @loco-philippe, very nice, please have a look at the rendered site, this update should be updated shortly, and open a follow up PR is something is not displayed as expected. Thank you very much for your time and help, you were efficient and quick !

The rendering of the bullet list is not ok ->  I will open an other PR.

Note: I have the same rendering problem with the last update of the PDEP-12, i will open another PR too
