Add badges

[eduferfer]

As a user, I'd like to track my achievements and see other users' ones as well.

• Create firestore badges collection and docs
• number of photos (levels 1, 2, 3, 4)
• number of species (levels 1, 2, 3, 4)
• number of followers (levels 1, 2, 3, 4)
• number of likes (levels 1, 2, 3, 4)
• Add cloud functions
• add numLikes array
• add followersUid array
• fix taxonUid array
• fix placeUid array
• send notification when badge is added
• Add UI carousel to profile page