[Developer-portal] Staging update with Rust and some code cleanup

Hi all, I have pushed an update to staging with the following changes: * Expand Rust install instructions: https://github.com/developer-portal/content/pull/524 * Fix Report an Issue button ( https://github.com/developer-portal/content/pull/532 and https://github.com/developer-portal/website/pull/138 )   * This change carries also a bit of deleting old code removal that seems to be no longer needed. The changes will be visible in max an hour on https://developer.stg.fedoraproject.org/ . Since there was a change on page content generation, if there are any new problems caused by that, I'm hoping it gets caught prior to release to production pages. I have not observed many, but more eyes should notice more. If anyone notices weird rendering of content and/or content sections that wasn't happening before, please file an issue (ideally include a screenshot) on: https://github.com/developer-portal/content/issues Thanks, Jarek Prokop