Create Codeheat 2017 webpage

This ticket lists the updates, issues, screenshots or screencasts related to Codeheat 2017 webpage. All the above will be documented in this ticket.

Reference: https://github.com/fossasia/2017.codeheat.org

This page inherits the homepage styles in the [reference](https://github.com/fossasia/codeheat.org/issues/359#issue-3149525163).

### TASK:

- [x] Add [Grand Prize Winners](https://github.com/fossasia/codeheat.org/issues/365#issuecomment-3134980158) section
- [x] Add [Finalist Winners](https://github.com/fossasia/codeheat.org/issues/365#issuecomment-3136125330) section
- [x] Add [Jury](https://github.com/fossasia/codeheat.org/issues/365#issuecomment-3136562043) section
- [x] Add [Mentors](https://github.com/fossasia/codeheat.org/issues/365#issuecomment-3144765019) section
- [x] Screencast of [sliding animations](https://github.com/fossasia/codeheat.org/issues/365#issuecomment-3145342567) for the above sections
- [x] [Change the aspect ratio](https://github.com/fossasia/codeheat.org/issues/365#issuecomment-3148508442) of the [three column images](https://github.com/fossasia/codeheat.org/issues/365#issuecomment-3134980158) from rectangular to square