Release Hacker, Mentor, and Volunteer Applications

[waalbert]

All applications will open December 6th.

• Mentor and volunteer applications are moving from Google Forms to our site, so our backend will need to be modified accordingly.
• On the Home Page, a section representing hacker, mentor, or volunteer applications called "Choose your character" needs to be added.
• The hacker application form can be updated from the last application form.
  • route /apply can stay the same
• Mentor and Volunteer application forms will need to be created.
  • routes /mentor and /volunteer need to be created
• The mentors and volunteers will use the same non-admin portal as the hackers.

• Add Links to Hacker, Mentor, and Volunteer Applications #397
• Volunteer Applications #396
• Mentor Applications #395
• Update Portal UI for Hacker, Mentor, Volunteer #398