Make the pages work as JS templates

- Stop doing the extra fetches for the pages on the backend
- Load the panel content from the appropriate page
- Import everything from jstemplates/pages/ in the index template
- Update the documentation to reflect the new style
- Update all of the included flavors

NOTE: The ids of the page templates begin with 'pages/'. A slash ('/') is technically not a valid character in an element id, according to the HTML spec. It works for now though. Keep an eye on it.
Add a multilingual demo flavor
Add upgrade steps to the CHANGELOG
Make the place-detail-promotion-bar a template partial
Move pages into correct folders for flavors
add mansfield flavor
make small change to config
change center
change form elements and title
add different colored markers
update about page, add icons
:
add Telex font
update styles to match website
updated header, font style
comment out zendesk and gauges for now
change field values
change map center
update base layer
remove folder, experiment with new base layer
Explicitly run manage.py with Python in the postinstall