Implement 404 page

[sauloperez]

We need to customize the Rails' default 404 page. It's not very user friendly. Looks like the server is on 🔥 .

Our proposal is something functional as the following but we're open to suggestions:

Note that the broken left-alignment is not intended.

[admir23]

Hi @sauloperez , may I work on this?

[sauloperez]

All yours @admir23!

[sseerrggii]

Can we solve the 500 error too?

[reneesandefur]

@sseerrggii how can I duplicate the 500 error?

[sauloperez]

This https://stackoverflow.com/questions/4156490/how-to-test-500-html-in-rails-development-env might do the trick but you can always change the code to make it break.