Create Codeheat 2018 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/2018.codeheat.org

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

### TASK:

- [x] Add [Hero, Stats, Sponsors, Projects, About, Timeline & FAQ](https://github.com/fossasia/codeheat.org/issues/369#issuecomment-3152900116) section
- [x] Add [Grand Prize Winners](https://github.com/fossasia/codeheat.org/issues/369#issuecomment-3170687046) section
- [x] Add [Finalist Winners](https://github.com/fossasia/codeheat.org/issues/369#issuecomment-3171612175) section
- [x] Add [Jury](https://github.com/fossasia/codeheat.org/issues/369#issuecomment-3172788519) section
- [x] Add [Mentors](https://github.com/fossasia/codeheat.org/issues/369#issuecomment-3175324482) section
- [x] [Screencast of sliding animations](https://github.com/fossasia/codeheat.org/issues/369#issuecomment-3175365634) for the above sections