Initial Markup for Home and About Pages

(Deals with #27.)

These changes provide initial HTML for two of the pages.

## Home Page

- Added a basic Google Map centered on Tulsa.
- Added request for user location.
- Added redirect after finding user location. (_/#latitude=...&longitude=..._)

## About Page

- Added basic markup.
- Added button linking user back to home page for location lookup.

## Questions

- I changed the _body_js_ block in _base.jinja2_ to force the scripts referenced in the base template to be included on every page. Not sure whether that is considered an anti-pattern when working with Django. Thoughts on improvement welcome.
- I also added an _about_ route to _urls.py_. It seems to work properly, but please comment if I missed something.