reconfigure service workers to only cache used assets (excluding .po language files and non-.var.woff2 font files)

* fix: turn service workers back on

* chore: configure service worker caches

* chore: add newline

* Fix code style issues with ESLint

* chore: limit service-worker caching
Co-authored-by: Zach Pomerantz <zzmp@uniswap.org>
Co-authored-by: Lint Action <lint-action@samuelmeuli.com>