pal docs

• Getting started: install, the hotkey, a ten-second tour, where the config file is.
• Config: the config file key by key, secrets, live reload, diagnostics, PAL_CONFIG and profiles.
• Palettes: every default palette, its actions and its settings.
• Scripts and data files: the zero-code tier, a palette from a data file or a shell script.
• Keyboard: the keyboard grammar.
• CLI: pal and its subcommands.
• Extensions: writing a palette in TypeScript.
• Releasing: how a release is cut and how the updater works.

Rendered from docs/README.md in the pal repo, 2026-09-16.