All kittens except for the broadcast and panel kittens have now been
ported to Go and so can be run with just kitten rather than kitty
+kitten. So update the docs to use this canonical form for launching
kittens
Add more text roles and links.
Add an example that broadcasts only to other windows in the current tab.
Initial capitalization of the key names in the kbd text role.
Add Python type hints for custom kittens.
Note about hyperlink support for ls on macOS.
Add description text for show_key.