feat(docs): home page enhancements and restructure

[mttrbrts]

Changes

• Adds Sections to homepage to highlight key features. We can do more here in future
• Adds a more hierarchical structure to the docs

Flags

• Changing the structure of the docs, will break existing links on external sites.

Author Checklist

• [x] Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• [ ] Vital features and changes captured in unit and/or integration tests
• [x] Commits messages follow AP format
• [ ] Extend the documentation, if necessary
• [x] Merging to master from fork:branchname
• [ ] Manual accessibility test performed
  • [ ] Keyboard-only access, including forms
  • [ ] Contrast at least WCAG Level A
  • [ ] Appropriate labels, alt text, and instructions

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