[$30] - New Listings - Navigation within listings page

[tladendo]

If you're on the /challenges page, and use the top navigation (Compete > Design, etc.), the URL hash will update, but the page won't update. Ideally, the listings component should update without a page reload.

[chq-matteo]

Notice that both pull requests are needed for this fix to work.

[chq-matteo]

I think that these patch will fix also #1161