Enhancement for Database

[abdullahzen]

• Restore back the 4 tables
• The category table is required for giving the user the ability to add new categories and link them to the new questions.
• The answer table is required to keep track of the best answers, upvotes, and downvotes.
• 4 tables provide better links and easier queries using inner joins
• Make sure there are columns for upvotes, favourites, and hidden. (maybe other columns are required as well later on)
• Favourites should be in a separate table

Story Points: 2
Risk Points: 8

[abdullahzen]

Reopened in #65 after failing

[abdullahzen]

Closed in #67