* Update ssh_backend.md
* Update normalize_output_to_unicode_nfc.md
* Update strikethrough_position.md
* Update underline_position.md
* Update underline_thickness.md
* Fix lua config docs titles to be formatted as inline code
* Mention how suggested alphabet for quick select is choosen
* Mention update-status and update-right-status for status_update_interval
* Fix docs for all keyassignments to be formatted as inline code
* Fix Lua object index titles
* Fix titles of `wezterm.*` module index pages
* Fix title of `Color` object & `wezterm.color` functions
We reduce titles from h2 to h1 because mkdocs defaults the page title to
the page file name if no h1 header is found.
* Unify title of all object methods
* Add index page for Gui events
