Login system

[gruelingpine185]

Description

Added more routes: login/ and signup/. These routes will act as the gate between the user, the game, and other related items.

Changes

• New files added to views/ for login/ and signup/ routes
• Added Colors for buttons/input UI elements. (Some already exist, but they are theme specific rather than universal)
• Moved all .html files in public/ to views/ (removes extension in url)
• Linked 404 page so that it get rendered on invalid route

Solves

• Closes Login System #109

[devkennyy]

• Add email verification step
• Add checks / requirements for passwords, emails and usernames
• Profanity filter
• Redirect to index after login
• Display username if signed in (beside navbar icon)
• Make login/signup pages use themes