make modal link path-based rather than query-based

[bobheadxi]

The initial implementation introduced in #94 uses query strings:

https://ubclaunchpad.com?project=physio+space#teams

Ideally this would be path-based, such that a link would look like:

https://ubclaunchpad.com/project/physio+space#teams

This change would mostly be for the sake of analytics, since paths are easier to sort through, and it just looks nicer. It also wouldn't cause too many issues because analytics indicate that hardly anybody uses the modal link feature at the moment, but we can maintain compatability with a redirect rule

[bobheadxi]

Update: on the analytics side I am using a hack to put the URL params into fathom trackPageview requests as if they were part of the normal path. Long-term I still think a path-based implementation would be a cleaner solution, however