fix(includes): rewrite need_improvement.txt as MyST so plain `{include}` renders correctly (backport #2016)

Manual backport of #2016 to sagitta — Mergify auto-backport failed
because sagitta's version of the file is a partial MyST conversion with
leftover RST garbage (`    \fi` line, RST `:ref:` syntax in MyST file).

Same fix as rolling: wrap the MyST admonition in `::::{only} not latex`
to preserve the LaTeX/PDF suppression from the original
`.. raw:: latex \iffalse / \fi` guard. `.readthedocs.yml` declares
`formats: - pdf`, so PDF output is a live downstream artifact.

Sagitta does not have the `{eval-rst}` wrapper around the include
that rolling had, so the highavailability/index.md change from #2016
is not needed here.

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