For State.local we use our very own Fun.ts instead of Gun.js. It's a light version of the Gun api with localForage only persistence. Localstorage is fastest — let's see if it suffices or if we need to change to indexeddb.
* test: add a couple initial tests for Translation.js
* ci: add build and test jobs to GitHub actions, along with lint
* test: remove old broken example test for the Header component
