Add pages for links, checkpoints, ship, push notifications, turning off
agent features and the tmux shim, and add them to the sidebar.
Update Agents, Architecture, CLI Reference, Configuration, Control
Protocol, Getting Started (the tuios-ghostty cask, Linux only, from the
next release), Hints, Hooks, Inbox and Review, Keybindings, Layout
Modes, Session Rail, Sessions, Themes, Web Terminal, Worktrees and herdr
Compatibility to match tuios.dev.
TUIOS PR #251 added an action and a setting that put hints mode
labels on every pane of the workspace, not only the focused pane.
Document both on the Hints, Keybindings and Configuration pages.
