- FEATURES.md: everything the app does.
- DOCUMENTATION.md: setting up accounts and OAuth, cloud attachments, writing in Markdown or HTML, OpenPGP, the GNOME Files entry, and what Hylki keeps on disk.
- KEYBOARD_SHORTCUTS.md: the single-key scheme.
- INSTALLING.md: every package, plus the beta channel.
- BUILDING.md: building from source.
- CONTRIBUTING.md: how to help.
- CREDITS.md: who has.
- MANIFESTO.md: what the project is for.
- RELEASING.md: what a release page says.
- RELEASE_NOTES.md: what every release brought, in the words the release page and About use.
- SECURITY.md: reporting a vulnerability privately.
- LICENSE.md: the licence and third-party notices.
Also at the top of the repository: CHANGELOG.md, and po/README.md for translators.
data/repo/ holds the artwork these pages and the README use, and
python3 tools/check-docs.py checks that all of it still hangs together:
links, anchors, this index, and where each kind of thing belongs
(CONTRIBUTING.md).