* docs: polish project documentation for a clearer public surface
Rewrite the README and supporting docs for a more professional first
impression: less emoji and badge noise, install-first structure, and a
real documentation index. Add a Contributor Covenant, tighten SECURITY
and GitHub templates, and make distro/update guides read as product docs
instead of internal status notes.
* docs: split install guide and add changelog plus support pages
Break INSTALL.md into a short primary guide, manual/PyPI package lists,
and troubleshooting. Add root CHANGELOG.md and SUPPORT.md, wire them
into the docs index and README, and drop the outdated screenshot lag note
now that v0.15 assets are on main.
* docs: humanize PR copy and remove em dashes
Strip em/en dashes from the documentation rewritten in this PR, fix
mid-sentence colon fallout from that pass, and smooth a few stiff
phrases so the public docs read more natural.
* docs: list Faster Whisper after rebase onto main
Installer and CLI already accept faster_whisper. Document it next to
the other engines, drop the outdated screenshot lag note, and keep the
on-device wording honest for local vs remote.
