- Don't document using `Vue.use(Vuex)` in store entry points (this harms
  testability)
- Add note about RFC to prefer named exports
- Don't document passing a store singleton to a component definition;
  this isn't what we do. Instead, just rely on a store being provided by
  an ancestor.
- Using `@vue/test-utils` for component test
- Document `localVue` usage