Link to each shelter

[jnolasco]

Now that we have shelterids, it would be extraordinarily helpful to be able to direct link to a shelter:

i.e. https://www.irmashelters.org/shelters/{id}/{shelter-name}

1. You'd only match the id, the shelter name is just in the url for readability.
   If the {shelter-name} is missing or misspelled or whatever, correct the address bar.

2. The url in the address bar should change whenever you click to a new shelter.

3. When loading irmashelters.org, the app should change the address bar to the "default collection" which is shelters. We can start thinking about other collections or layers like needs or volunteers.

4. An important part of this is that all URLs will have to be routed to index.
   I don't know if thsi solve the problem, but I'd start here: https://www.google.com/search?q=reactjs+route+all+urls+to+index

Let me know if you tackle this otherwise I can take a stab at it tonight.