Extend the docs with "ask ai" links to templated queries

[nolar]

TODOs:

• Check if pageurl is populated in ReadTheDocs (empty locally).
  • Nope, it is empty too (in the PR build).
• ❗️ Find a variable for the absolute page URL, including the stable/latest version split.
• Reduce the margins of the following ToC.
• Try moving this to the top-right buttons bar (where dark/light mode is; but Furo (theme) has no such blocks).