Add a cities list page

[sarayourfriend]

For now just add this under a hidden route /cities. Start with the existing index.html.bak and work from there. We need to make sure to include a noscript version as well, probably just a static list of the cities we have.

[sarayourfriend]

This is still an interesting issue but will take some consideration for how to correctly implement it. Not just because we want to have a lightweight noscript version (that's a secondary concern) but mostly because we don't want to make the default page that people already expect to find Seattle resources on suddenly turn into a landing page of a cities directory.

Deploying sub-paths for each city would be a good approach, like not911.me/st-louis for example. But we should leave the default page as Seattle with a link to "More cities" on the Seattle page to the /cities path.