Display slug on submission detail

[spMohanty]

Currently the links are of the form : https://www.crowdai.org/challenges/25/submissions/5417

but if we want people to share them, then ideally they should be more SEO optimized and of the form :

https://www.crowdai.org/challenges/[challenge-slug]/submissions/5417

[spMohanty]

the links on the submission page still use the numeric ids and not the slugs : https://www.crowdai.org/challenges/mapping-challenge/submissions

Can be replicated by clicking on the X for every submission in the link above.

[spMohanty]

[scarroll32]

Make the challenge heading a link.

To be redesigned

[scarroll32]

Implemented

[spMohanty]

Reopening this issue, as the issue still persists in the "Submissions" page.

Example : https://www.crowdai.org/challenges/nips-2018-ai-for-prosthetics-challenge/submissions

You can see if you click on the Expand submission button.