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.
When using icat with tmux we get the following:
```
$ kitty icat ~/Pictures/fc.jpg
Terminal does not support reporting screen sizes via the TIOCGWINSZ ioctl
```
I found a suggestion[1] this is due to limitations between kitty and tmux, so I'm raising this PR to either confirm this is the case and make it clear in the documentation, or to have it rejected so an issue can be raised to address the feature.
1: https://unix.stackexchange.com/a/484776/41996
