Fix endpoint

What does this MR do and why?

Fixes #412880

I did some investigation and there is a bug in the next button. The button changes the url of the page and adds a .json at the end of the pathname. So, when you click on next button, you are supposed to go to this link: https://gitlab.archlinux.org/explore/projects?name=stat&non_archived=true&page=2&sort=latest_activity_desc but instead, you are directed to this link: https://gitlab.archlinux.org/explore/projects.json?name=stat&non_archived=true&page=2&sort=latest_activity_desc.

This issue is only visible when you have a string added in the search inputbox. So, the next button works well if your search input box is empty.

I am suspecting this is due to the fact that the end point that we are hitting is this /api/:version/projects.json (app/assets/javascripts/api/projects_api.js) and this is due to the fact that we have a replace method to change it. I removed the replace method and it should work well now.

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