It's a tiny library that has not been updated in years, and it was
leading to a warning on startup:
DeprecationWarning: invalid escape sequence \W
return re.sub("\W+", "", string)
Recommend removing ts/node_modules folder before attempting to
build after this update.
This moves ts/node_modules into the root of the project to work around
https://github.com/ankitects/anki/pull/1405#issuecomment-936213861
Also fixes the sass errors shown when running scripts/svelte-check
