Documentation for Registry-configuration to complete Todos

[boss6825]

Issue number - 1882

• Fixes Backend > Configuration Registry needs content (GenericSetup) #1424 and Purge empty pages and todos #1882

Description

Write a description of the fixes or improvements.

Completed the todos for Configuration Registry - https://6.docs.plone.org/backend/configuration-registry.html

I took the following as reference for this:

• https://pypi.org/project/plone.registry/
• https://pypi.org/project/plone.app.registry/
• https://5.docs.plone.org/adapt-and-extend/config/configuration-registry.html
• https://5.docs.plone.org/develop/plone/functionality/controlpanel.html
• https://5.docs.plone.org/adapt-and-extend/theming/resourceregistry.html
• https://5.docs.plone.org/develop/addons/components/genericsetup.html

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📚 Documentation preview 📚: https://plone6--2042.org.readthedocs.build/

[boss6825]

I have tried to verify deprecated stuff from older versions , would appreciate reviews and suggestions, especially if anything needs further correction or improvement.