frontend: integrate homepage AND signup/login page

[ezronis]

acceptance criteria:

• pull develop into homepage branch and resolve conflicts
• integrate frontend homepage with backend code (replace backend code with YOUR stuff in homepage branch)
• integrate login with backend code (views and URLs to connect profiles/templates/login.html to your login button on the homepage)
• integrate sign up with backend code (views and URLs to connect profiles/templates/signup.html to your sign up button on the homepage)