[FEATURE] Notifications

[proverbial-ninja]

Describe the user story:

Users should get notifications triggered by different events.

Tasks (where applicable)

here are the events that trigger notifications and where the user is (re)directed when they click the notification

event	target	taget has id	redirect /link to	done ? (✓) or (✗)
Chapter Comment	chapter creator	TRUE	Chapter page	[ ]
Comment Reply	parent comment user	TRUE	Chapter page	[ ]
Earned Acheivement/Badge	user (acheiver)	FALSE	My profile page with list of badges	[ ]
Chapter Published (for approval)	moderators	FALSE	Approval dashboard	[ ]
Chapter Approved	chapter creator	TRUE	Single chapter page	[ ]
Role change	user	FALSE	Profile page	[ ]
leaderboard rank change	user	FALSE	Leaderboard page	[ ]
Rating	chapter creator	FALSE	Teacher dashboard page	[ ]
Likes/dislike	chapter creator	TRUE	chapter page	[ ]
Survey	user	TRUE	Survey page	✓