gh-149902: Remove dead packaging docs link and add a new secition for external resources

[miameows]

Hi folks,

This PR removes a link to "Distributing Python Modules" from the front page of the docs. Said page was empty save for a message telling users to go to packaging.python.org. It was already marked as an orphan, so I removed the link and made a new section for "Other resources", linking packaging.python.org and (at the suggestion of Petr) typing.python.org.

I understand this is a fairly visible change and will probably require some discussion (and possibly modification) before it's ready to merge. I'm here to answer any questions or fix issues.

Before:

After:

cc @encukou (helped me plan this approach) and @nedbat (docs team)

Closes #149902

Thank you!

• Issue: "Distributing Python Modules" link on docs front page is effectively empty #149902

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #32751075 | 📁 Comparing 7187979 against main (5775aa8)

  🔍 Preview build  

8 files changed · ± 8 modified

± Modified

• index.html
• library/dataclasses.html
• library/inspect.html
• library/os.html
• library/pathlib.html
• library/stdtypes.html
• whatsnew/3.15.html
• whatsnew/changelog.html

[StanFromIreland]

With this we'll have two "Other resources" sections, one in the sidebar and one here, why not add these to the existing one?

[JelleZijlstra]

The "Other resources" section also has two links to the deprecated Python wiki, maybe we should drop those and link to packaging.python.org and typing.python.org instead.

[hugovk]

Do we need both "Other resources" sections?

If yes, should they both contain the same things?

If not, which shall we remlve?

---

Perhaps the wiki books link could be replaced with
https://www.pythondiscord.com/resources/?type=book or https://pythonbooks.org/ ?

See also #148998 for more general wiki cleanup.

[miameows]

I'm in favor of removing the other section if it links to outdated content

[miameows]

I think the placement of this new section should be fairly prominent, considering it contains a link that was (indirectly) already featured front and center. I think it's helpful to have a "signpost" of sorts so users who do a web search for "Python documentation" can easily find related resources without having to look at the small text in the sidebar. I'm of the opinion that sidebars are for navigation of complex hierarchies, not holding content