chore(gruntjs): remove concurrent task from the default task and replace it by nodemon:dev only.
refactor(pinnedAppsGroup): replace pinnedAppsGroup by favgroup
refactor(appCategory): replace appCategory by category + a bit of cleaning
refactor(user): remove unnecessary line of code
refactor(config/env): correctly set env config
feat(auth): add temporary login form

This will be replaced later. For now it's just to test the app on mobile app where it's difficult to spoof the http headers
feat(header): replace menu title by icons
refactor(app): replace pin term by favorite + add star icon instead of a pin icon