Persist Template Categories

[thanasis457]

Description

Right now the app has two categories - "food" and "takeout". Adding or removing categories on the template builder does not persist through reloads or after switching pages. Use the react-redux-firebase/redux-firestore reducer to correctly update the categories and persist them on the database (or fix existing functionality that is not working).

When removing a category, it should also be removed from all providers that have it in their description.

• Adding categories works
• Removing categories works
• Updating/Modifying categories works

You will probably need access to Firebase. If needed, slack me (Thanasis Taprantzis) and I will grant you access.

Please test thoroughly for any bugs.