Fix layout issues and add overview pages that are missing in some sections

[Doommius]

Pull Request Template

What are you trying to address

• Write a detailed description of all changes - and if appropriate, why they are needed

[github-actions[bot]]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	2		0	0.02s
⚠️ MARKDOWN	markdownlint	257		1	6.33s
⚠️ MARKDOWN	markdown-table-formatter	257		1	0.54s
✅ MDLINKCHECK	linkcheck	257		0	9.13s
✅ SPELL	cspell	268		0	11.65s
✅ YAML	prettier	10		0	1.78s
✅ YAML	yamllint	10		0	0.5s

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[TessFerrandez]

@tompaana @shiranr could you please review?