Customize: Add Dynamic Registration Of Static Pages Through Config

[Samk13]

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Description

• Update the documentation to incorporate the changes introduced in 2651

• Added missing syntax highlighting to Markdown code blocks in static_pages page.

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• [x] I'm aware of the code of conduct.
• [x] I've created logical separate commits and followed the commit message format.
• [x] I've added relevant test cases.
• [x] I've added relevant documentation.
• [x] I've marked translation strings.
• [x] I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• [x] I've NOT included third-party code (copy/pasted source code or new dependencies).
  • If you have added third-party code (copy/pasted or new dependencies), please reach out to an architect.

Frontend

• [x] I've followed the CSS/JS and React guidelines.
• [x] I've followed the web accessibility guidelines.
• [x] I've followed the user interface guidelines.

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