DOC: Gitpod documentation
xref #48107  

Documentation for using the development Gitpod.
I got some warning about the title capitalization in pre-commit. But it was relating to `Gitpod` and `Liveserve`, and words after the colon, which I wasn't use about the style guide there. Is that a problem? What's your recommendation here? I would prefer the brands to be capitalized in the titles.  For the capitalization, there is a list of exceptions that get ignored here:  https://github.com/pandas-dev/pandas/blob/e41b6d7827720df90a51ff05caa689333d7e02af/scripts/validate_rst_title_capitalization.py#L21 This pull request is stale because it has been open for thirty days with no activity. Please [update](https://pandas.pydata.org/pandas-docs/stable/development/contributing.html#updating-your-pull-request) and respond to this comment if you're still interested in working on this. @jorisvandenbossche current pre-commit errors are about changing "I" or "I'm" in headlines to lower case "i". 
Should I need to add those to the capitalization script as well? I think it makes sense to add I as an exception Merging, we have a sprint tomorrow and would like to reference to this.

Please ping with suggestions, if we should improve anything thx @noatamir 