docs: add related content section to components guide

[Roshani-97]

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Issue number

-Fixes #1973

Description

Adds a Related Content section to the Components conceptual guide to improve navigation between related documentation pages.

Add screenshots or links to a preview of the changes

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📚 Documentation preview 📚: https://plone6--2026.org.readthedocs.build/

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[boss6825]

@Roshani-97 the content that you have added isn't even relevant to the components page .

[stevepiercy]

@boss6825 thanks for the review. I agree.

@Roshani-97 I'm suspending you for 24 hours from the Plone GitHub organization to give you time to read and follow First-time contributors, especially Things not to do, Contributing to Plone, and Contribute to documentation.

[Roshani-97]

Thank you for the notice and for pointing me to the relevant guidelines.
I understand my mistake and will carefully read and follow the First-time contributors, Things not to do, Contributing to Plone, and documentation guidelines before contributing again.