docs: drop bogus cookiecutter-zope-instance PyPI link; refresh llms.txt

The template is used directly from GitHub via
`cookiecutter gh:plone/cookiecutter-zope-instance` and is not published on
PyPI. Remove the PyPI nav link from the theme and the PyPI line from llms.txt,
replacing it with an install note.

Refresh the llms.txt "Documentation Sections" to match the current how-to
lifecycle, the sample-configurations reference, the configuration-workflow
explanation, and the new glossary.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jensens

docs/sources/conf.py

@@ -44,10 +44,6 @@
             "title": "GitHub",
             "url": "https://github.com/plone/cookiecutter-zope-instance",
         },
-        {
-            "title": "PyPI",
-            "url": "https://pypi.org/project/cookiecutter-zope-instance/",
-        },
     ],
 }
 

docs/sources/llms.txt

@@ -13,7 +13,7 @@ configuration file.
 - License: GPL-2.0
 - Python: 3.10+
 - Repository: https://github.com/plone/cookiecutter-zope-instance
-- PyPI: https://pypi.org/project/cookiecutter-zope-instance/
+- Install: used directly from GitHub via `cookiecutter gh:plone/cookiecutter-zope-instance` (not published on PyPI)
 
 ## Features
 
@@ -103,6 +103,7 @@ separator for nested dict values.
 ## Documentation Sections
 
 - [Tutorials](tutorials/index.md): First instance, Docker deployment
-- [How-To Guides](how-to/index.md): RelStorage, PGJsonb, ZEO, z3blobs, CORS, env vars, upgrading
-- [Reference](reference/index.md): All configuration variables documented
-- [Explanation](explanation/index.md): Storage backends, blob handling, rationale
+- [How-To Guides](how-to/index.md): set the listen host/port, configure a storage backend (filestorage, RelStorage, PGJsonb, ZEO, z3blobs), configure the application (CORS, logging, product-config), deploy to production (reverse proxy, environment variables), enable debug/profiling, operate (pack/GC, backup/restore, migrate storage), upgrade
+- [Reference](reference/index.md): All configuration variables, plus sample configurations
+- [Explanation](explanation/index.md): Storage backends, blob handling, configuration workflow, rationale
+- [Glossary](glossary.md): Key terms (blob, FileStorage, RelStorage, ZEO, PGJsonb, ZODB)