Improve Accordion UI + Mobile Badges + CSV Encoding Bug

Description

• Improves accordion UI to distinguish between courses clearly
• Improves mobile badges to display nicely
• Removes the logged-in homepage
• Fixes CSV Encoding Bug
• Improves My Applications page - Hiring/Rejection Messages Visible
• Makes it possible to accept/retract from my applications page

Related Issues

• Resolves #119 (closed)
• Resolves #128 (closed)
• Resolves #133 (closed)

Checklist

• I have added a changelog entry to reflect the significant changes I made.