* Replace all instances of mw-ui markup with Codex markup
* Use codex-search-styles
* Where codex-search-styles is not installed (e.g. 1.39)
register an alias which points to @wikimedia/codex as that is
available.
Bug: T340255
Bug: T340257
Change-Id: I4f3ddfb68ea6c033ee7a49729187f4ddbc8abe5c