shareable modal links

[bobheadxi]

we can already lead users directly to sections using URL hashes, e.g. https://ubclaunchpad.github.io/new/#join

It would be cool if we can allow users to link directly to, say, a project modal:

    const uri = window.location.search.substring(1); 
    const params = new URLSearchParams(uri);
    console.log(params.get('project'));

1. scroll to #projects (or, when generating a link to modal, just include /#projects
2. open up modal to params.get('project')