Move existing homepage to /dashboard route
Move existing homepage to /dashboard route

Current homepage is inaccessible to the first-time user. Users must
specify query parameters to access the information they want. First-time
visitors will have no way of knowing what those queries are. Even if
they did, typing them into the URL string is a time-consuming and
error-prone process.

To alleviate this problem, this commit moves the existing homepage to a
/dashboard route so there's room to develop a landing page for
first-time visitors. This landing page will make the now /dashboard page
easier to access. Most likely, the new homepage will contain a <form>
element to programmatically generate a /dashboard URL.

See: #6

geoffreyyip/mta-dashboard,geoffreyyip/mta-dashboard