[6.12] Footer Updates

- The footer shall be updated to include:
> - Call for Speakers https://tally.so/r/rjBeN5
> - Enter Hackathon https://hackerrivals.com/

- Existing footer navigation shall be updated as needed to support the new structure and functionality.
- Any current popup/footer label referring to committee/volunteer naming shall be updated to:

> - Committee and Volunteers