Init `public/config.js` with `requiredFields`, `hiddenFields`

public/config.js

public/config/config.json.sample

src/app.less

src/assets/locales/en.json

src/assets/locales/fr.json

src/components/OrganisationCreation.vue

src/main.js

src/store/modules/terms-of-use.store.js

src/views/NotFound.vue

src/views/SignUp.vue