* docs: remove --include-desktop install instructions
Drop the --include-desktop curl one-liner from the desktop app docs.
The flag remains in scripts/install.sh; these docs now point to the
desktop installer / website and the 'hermes desktop' path instead.
* docs: remove --include-desktop from install docs
Drop the redundant 'Hermes Desktop installer on Linux' block (which
used --include-desktop) from quickstart, installation, and index docs.
The website installer covers macOS/Windows desktop; the CLI-only path
covers Linux. Removes the flag from all user-facing docs.
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