Add home page, trial functionality

[LMAOboxhack]

Description

Add home page, trial functionality

Changes for Sprint 6:

• Fix bug with profile also showing git handle
• Add IDE configs for linting, syntax highlighting
• Add home page

Changes for Sprint 7:

• Add start date to course creation
• Change course creation to modal
• Fix image loading blocked by authentication
• Add captions to screenshots
• Refactor trial user logic
• Add unit tests for backend
• Add user tutorial

Screenshots (if applicable)

Additional Notes

Closes #151

[codecov]

Codecov Report

Attention: Patch coverage is 95.65217% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 89.65%. Comparing base (e4d2561) to head (1bfa64b).

Files	Patch %	Lines
backend/services/githubService.ts	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging     #167      +/-   ##
===========================================
+ Coverage    85.71%   89.65%   +3.94%     
===========================================
  Files           26       26              
  Lines         1393     1402       +9     
  Branches       242      244       +2     
===========================================
+ Hits          1194     1257      +63     
+ Misses         185      130      -55     
- Partials        14       15       +1     

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[auhc99]

lgtm