Add Practice Interview Page

[ROODAY]

Create a publicly accessible page that allows users to practice on old questions. Allow users to select a level and then randomly generate an "interview" out of questions from that level. This way potential candidates can get a feel for the questions they might be asked (only select questions that are marked as public to prevent leaking of current interview questions, these questions can be marked through the admin interface in #20).

This task is low priority and requires the following tasks to be completed first:

• Store questions in Firebase + Admin Panel #4
• Switch to PostgreSQL as database solution #8
• Create Admin Interface #20