migrate docs to RTD

[minrk]

closes #128

I ended up here from:

1. adding intersphinx link from jupyterhub docs for https://github.com/jupyterhub/jupyterhub/issues/4401
2. noticed unusual URL and old date
3. noticed gh-pages builds has apparently never succeeded on main

• [x] stop building gh-pages, which hasn't been working for a while
• [x] publish to RTD
• [x] update links in README
• [x] update project link
• [x] add redirects from gh-pages to avoid breaking existing links (#298)
• [x] update nbgitpuller.link to point directly to the new URL (@yuvipanda controls this? I'm not sure how it works)

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[yuvipanda]

Ya that domain is with me, happy to repoint it. As long as existing links to the generator don't break, all <3

[minrk]

New link is up at https://nbgitpuller.readthedocs.io/en/latest/link.html, if you want to update nbgitpuller.link.

working on setting up redirects, and noticed weird behavior that the current nbgitpuller.link is pointing to https://hub.jupyter.org/nbgitpuller/link which should be 404 (missing .html), but apparently gh-pages automatically adds .html if it's missing? RTD doesn't do that, so a simple rewrite of the URL doesn't quite work. I'm not sure how important it is that all of those redirects work, since no navigation will arrive there, and nbgitpuller.link can be updated itself.

[minrk]

298 adds all the redirects, including the gh-pages special case

[yuvipanda]

@minrk nbgitpuller.link redirect updated!

[minrk]

link generator on RTD doesn't quite work. I believe due to a theme update, some CSS selector assumptions aren't held.

[minrk]

this now fixes the link generator as well to be compatible with the updated bootstrap in the sphinx theme

[minrk]

There might be some time pressure to merge this, since now all the links are pointing to the not working link generator page, which is fixed by this PR.

[frankier]

For me, the link generator is still not working.

[consideRatio]

Are you unable to access https://nbgitpuller.readthedocs.io/en/latest/link.html @frankier, or do you mean that the link generator generated links when having third party cookies disabled isn't working against mybinder.org?

[frankier]

For me, nothing appears in the "generated binder link appears here" box

[consideRatio]

@frankier when generating a nbgitpuller link for use with mybinder.org that first builds a docker image before it sends a launch request to a jupyterhub, you need to enter two separate URLs.

One for the git repository that is used to build a github image, and one for the content to be pulled with nbgitpuller. Otherwise, a normal mybinder.org link would suffice I think.

There is certainly a UI bug of having a green checkbox on "Git content repository URL" even though its not filled in and is required to be filled in to work.

[frankier]

Whoops! I was so used to it not working, I suppose I just read that as still broken. Sorry for the noise.