Add Plone dependency diagram and documentation references

[jyotimahato-12]

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Issue number

• Fixes Overview: Create a dependency diagram using pipforester and pipdeptree #1281

Description

_Added Plone dependency diagram and QR code to the documentation.

• Plone Python dependency graph (_static/plone-dependencies.png and .svg) included
• Updated index.md and docs/index.md to reference the diagrams
• Helps contributors visualize Python package relationships and detect cyclic dependencies

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📚 Documentation preview 📚: https://plone6--2021.org.readthedocs.build/

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[stevepiercy]

I'm sorry, but this PR has so much unrelated stuff thrown in, it's not reviewable. We only need that which is described in the original issue. Please revert all unnecessary and additions.

[stevepiercy]

This doesn't belong here. Please follow the original issue directions.

[stevepiercy]

This file should not be deleted, but modified.

[stevepiercy]

This file should not be added. It's in the wrong place, and we already have docs/index.md.