Implementation of a new feedback pop-up page across the app

[mooesy]

Implement a new global feedback pop-up page that:

1. Appears every time the user closes a dialogue (hits the close button or "x" at the top right corner.) The pop-up action is stopped once the user fills out the survey.

2. Implement it in a way that the survey responses are logged into the Firebase database, the same as "browsers," "ages," "devices" and other data.

[mooesy]

The issue is closed because the requirement has changed. #860