docs: finish RST→MD conversion on sagitta

Port docs/cli.md and docs/installation/cloud/aws.md from rolling
(the canonical, production-tested MyST versions) and remove the
remaining cli.rst + aws.rst. Earlier conversion attempts on
myst/sagitta had title-level errors flagged for separate fix;
rolling's versions are clean.

Drop the `cli.html` workaround in `_templates/llms.txt.j2` now that
`cli.md` exists and is copied by `_copy_md_sources` — matches the
rolling-branch template byte for byte at that line.

🤖 Generated by [robots](https://vyos.io)

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