Docs: Rebase against newer starter pack

[medubelko]

What needs to get done

• Once the starter pack improvements are complete, rebase the docs against it.
• Correct any warnings or errors in the docs resulting from the new tests.

Why it needs to get done

We're using an old version of the RTD starter pack. The latest version is more modular, relying on extensions over bespoke configuration code, and will remove issues related to dependency management. It also provides testing with Vale, so we’re missing out on checks for basic style adherence. The documentation team is also developing additional tests and analytics that will land at the end of this cycle.

We should rebase so the docs benefit from these developments.

[syncronize-issues-to-jira[bot]]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3490.

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