Update docs theme to sphinx-immaterial

[ZacBlanco]

Updates our old docs theme to to sphinx-immaterial theme. Fixes the issue with the logo and makes the site feel a little newer.

Fixes #22817

[steveburnett]

Nice! Thanks for including the screenshot of the new style. I've done a local build of your branch and it looks the same as your screenshot, which is not surprising at all but nice nonetheless.

One question:
Is it possible for us to keep the "View page source / Edit this page / Create docs issue / Create project issue" links in the existing doc's right sidebar?
(Screenshot of the existing Presto Concepts for comparison with your screenshot.)

[ZacBlanco]

This should work now. I also added a light/dark mode toggle which is a feature of this new theme:

[steveburnett]

LGTM! (docs)

Pull updated branch, new local docs build.

• The "View page source / Edit this page / Create docs issue / Create project issue" links in the existing doc's right sidebar are back as requested.
• The light/dark mode toggle is present and it works - thanks for adding it in!

I have no other concerns. This fixes the original problem of the missing Presto logo, updates us to a currently-maintained Sphinx theme, and adds a light/dark mode feature for our readers. Thanks!

[ZacBlanco]

@tdcmeehan would you like to look before I merge this?

[tdcmeehan]

Thanks @ZacBlanco !

[steveburnett]

Just noticed this today, not sure when it happened.

Some of the right border tables of content for individual pages have the headings preceded with a purple "M" character.

This affects most of the pages in /functions/ and in /rest/, but I didn't find this problem elsewhere in the Presto doc set.

I'm not seeing any errors or warnings in a local docs build that would explain this.

Example screenshots from a local docs build of https://prestodb.io/docs/current/functions/conversion.html, and https://prestodb.io/docs/current/rest/node.html.

[ZacBlanco]

@steveburnett That's part of the theme -- when using the ..function:: directive in the RST the theme inserts M (for "Method"). I can see about removing it if you think it's distracting

[steveburnett]

@ZacBlanco thanks - I thought they might be a feature of the theme instead of a bug, but I wanted to ask. If you can find an easy way to disable this feature, I'd appreciate it.