[FEATURE] Add reporting mechanism

[awpala]

Is your feature request related to a problem? Please describe.
There should be a mechanism to flag for review.

Describe the solution you'd like
For now, let's just add an icon (only available to logged in / auth users) that creates a new write operation to a document in the Firestore db with the reviewId and count(s) of reports (make reportable only once per user per review, i.e., disable button after initial click).

Describe alternatives you've considered
Integrate into auto-email notification. This will be more complicated to implement, and out of practical scope for present purposes.

Additional context
(N/A)