Add Create a backend add-on section in the Developer guide.

[stevepiercy]

• Enhance the Development Guide index
• Update the term Buildout in the Glossary to point to dusty old, yet useful, docs in Plone 4.

See #1748 (comment)

Closes #1754.

Ping @petschki to take it from here.

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📚 Documentation preview 📚: https://plone6--1757.org.readthedocs.build/

[davisagli]

I don't quite get your vision for this section yet.

Most of the documentation that can be written about how to create a backend add-on will be relevant regardless of how Plone was installed, and also regardless of whether the add-on was created from a Cookieplone template, bobtemplates.plone, or by hand.

So mentioning buildout here is off topic.

And learning about GenericSetup is a piece of what goes into creating an add-on, but it's certainly not the only or the most important piece.

[stevepiercy]

I created this file to jump start something for @petschki to work on. I have no vision about this whatsoever. If the snippets aren't needed, they can be tossed out.

I moved the snippets here from another document that had them as headings in a how-to guide, instead of in a conceptual guide. IOW no one does "How to Buildout and GenericSetup".