[$5] - Add option to use new listings page

[ajefts]

As we get make progress on the new challenge listings experience, let's add a link to the new experience from the existing challenge listings page. It should be something at the top that directs to user to try to new experience at www.topcoder.com/listings.

[ajefts]

@birdofpreyru Can you add this one to the list? I don't have a design for it, but I was hoping you guys could come up with something clean and simple. This should just link people to the new experience, and not set any kind of preference.

Thanks.

[birdofpreyru]

@ajefts Sure! Does it look fine to you, if we store selected option in the user browser's localStorage, and thus keep all changes at the frontend side, without messing with the backend?

[birdofpreyru]

@ajefts Sorry, I have not read you previous msg carefully enough. So, just a link to the new listing, not a switch, no need to store the choice at all?

[birdofpreyru]

Expected Fix

In all current challenge listing pages (design, development, data science, served by the code in https://github.com/appirio-tech/tc-site) add under the title the link to the new challenge listings (/listings endpoint), like so:

The link text reads Get a glimpse of the new challenge listing page (alpha version).
The style (color, font size) of the link should match the one of Past Challenges, Upcoming Challenges, Review, and the (alpha version) part should be a superscript.

[ajefts]

That works for me. Thanks!