Add permalinks to pages to avoid .html extension

[peey]

Closes #89

[peey]

@virresh seems to work. Have a look.

[virresh]

Actually if I look back at netlify deploys, it works regardless:
Deploy from last merged PR: https://deploy-preview-88--brave-nightingale-ea2673.netlify.com/hackathons

This is probably because netlify already uses nginx to serve pages and nginx handles url re-writes much more cleanly than latest apache version
So unless we merge it, I don't think we'll be able to test it out (or we sideload directly this branch on server rather than polluting the commit history)

[virresh]

(And same goes for gh-page deployment as well): https://iiit-delhi.github.io/byld-website/hackathons

[peey]

I'm confused about why netlify is working prior to this fix. We don't have a htaccess file committed.

Where exactly are we directing nginx/apache server to rewrite a.html to a?