Revamp Sphinx theme

[jezdez]

We use the custom conda Sphinx theme in a number of repos which makes it much harder to update the way the docs look like.

As a first step we should move the Sphinx theme in a separate repo, e.g. conda-sphinx-theme, and enable it in all repos that make up conda.io. This work is in preperation of #747 and other related issues.

[jezdez]

/cc @jaimergp

[github-actions]

Hi there, thank you for your contribution!

This issue has been automatically marked as stale because it has not had recent activity. It will be closed automatically if no further activity occurs.

If you would like this issue to remain open please:

1. Verify that you can still reproduce the issue at hand
2. Comment that the issue is still reproducible and include:
   - What OS and version you reproduced the issue on
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Thanks!

[jaimergp]

Not stale.

[travishathaway]

@jezdez, please create a conda-sphinx-theme repo in the conda-incubator organization.

[travishathaway]

New theme has been created here: https://github.com/conda-incubator/conda-sphinx-theme

[travishathaway]

Considering this new repository has been created, I am considering this issue complete.

Work for actually using this theme for individual projects will be tracked in other issues. See #776 for a full list.