Fixes gallery ToC

[melissawm]

Description

• Orders gallery by example title
• Restores left sidebar for individual example pages

Type of change

• Fixes or improves existing content
• Adds new content page(s)
• Fixes or improves workflow, documentation build or deployment

References

Closes napari/napari#5057
Closes napari/napari#4963

This PR also depends on napari/napari#5458

Final checklist:

• My PR is the minimum possible work for the desired functionality
• I have commented my code, particularly in hard-to-understand areas
• I have added alt text to new images included in this PR

[melissawm]

Before:

After:

[psobolewskiPhD]

I love this fix for the ToC, but when I download the build docs from this PR I don't see the gallery of thumbnails anymore:

Also, is it possible to get rid of the now useless Tags submenu here:

IOW, just have the Gallery ToC list the tags?

[melissawm]

That is strange 🤔 I do see them locally so will investigate - thanks for checking.

[melissawm]

Argh - of course this is not working correctly, because it depends on napari/napari#5458. Once the two PRs are merged, then we'll see the correct result. If you want to build locally and try it, you can check out both prs and build the docs. Sorry about the confusion 😅

[melissawm]

Also, is it possible to get rid of the now useless Tags submenu here:

This is a little bit trickier, because the toctree to generate that submenu is like this:

```{toctree}
:maxdepth: 1

_tags/tagsindex
```

where tagsindex is populated by the tags that are found during the docs build. I will try to play around with this a little

[psobolewskiPhD]

Argh - of course this is not working correctly, because it depends on napari/napari#5458. Once the two PRs are merged, then we'll see the correct result. If you want to build locally and try it, you can check out both prs and build the docs. Sorry about the confusion 😅

Oh my bad!
Anyhow, I did that and it works!