feat: route everything via env vars

.env

.env.development

.eslintcache

.gitlab-ci.yml

package-lock.json

package.json

public/index.html

src/App.js

src/components/CrossroadCard.js

src/components/PageTitle.js

src/components/VNav.js

src/config.js

src/pages/Accommodation.js

src/pages/Home.js

src/pages/Map.js

src/pages/Registration.js

src/pages/Team.js

src/pages/Volunteers.js