OpenPlex 0.28.1

perf(ui): leave out the parts of Monaco the panel never loads

The copy of Monaco embedded in openplexd drops the editor's UI
translations (only fetched when a UI language is configured), the old
copies of the language workers (the editor loads them from assets/),
and the 7 MB TypeScript/JavaScript language service, whose features the
editor now turns off so its worker is never started; JavaScript and
TypeScript keep their syntax highlighting. Monaco goes from 25 to
7.5 MB and the binary from 43.9 to 27.0 MB.