[Hart] Initial checkin for cobrand

Originally copied from template of Bromley code, substituting logo, council
ID, geolocation data, and renaming .scss variables etc.

(NB: this was a bad idea.  As per notes/cobranding.txt, should have
started with less copying of files, as this required more cleanup.
The current branch has been rebased to present a slightly idealised
picture of the process.)

Some code cleanup and added is_two_tier
[Hart] First pass at branding

* Add Hart-specific links to footer
* Shift FMS nav out of the main header
* Update styling to follow design more closely
* Flip nav colours to better indicate links
* Make header banner entire width of the page
* Stretch footer bg to entire width of page
* Add top-level nav links
* Correct header height on mobile
* Correct wording of top menu item
* Remove FMS logo from top of page
* Shift top level nav to correct position
* Invert media query so IE8 displays header properly
* hide folding triangle, as makes no sense on this cobrand
* Some more renaming of Bromley to Hart
* Treat Hart the same as Bromley in the JS
* Whitespace/formatting fixes
[Hart] Basic test for cobrand
[Hart] Javascript #map_box fixes

Make sure #map_box is not in desk-only

Fixing a Javascript error:
https://github.com/mysociety/FixMyStreet-Commercial/issues/470

Also ensure there is only one .wrapper, which has the #map_box attached
to it, to avoid duplicated maps.
[Hart] colour tweak

as requested by Mike to better match colours in council-provided assets.
[Hart] Change an example place to a postcode
[Hart] FAQ changes

Towards https://github.com/mysociety/FixMyStreet-Commercial/issues/478
[Hart] remove more Bromley customizations

(noted in tickets:
mysociety/FixMyStreet-Commercial#474
mysociety/FixMyStreet-Commercial#475 )
[Hart] Zoom level 3
[Hart] Move cobrand back to FMS.com template

Adding the hart additions into the main fms.com cobrand's templates,
rather than building off bromley's weirder set up, so that we get things
like a full screen map for free

Switch templates to put navigation in footer, as FMS.com does
[Hart] Move 'Powered by' banner into main content

This will mean we don't have to clear is in css, and we then don't break the map
[Hart] reset various CSS/templates/js

more fixes from Bromley to default behaviour
[Hart] substitute blue tab for green in mobile view
[Hart] remaining HTML/CSS changes for large map

Fixes by @stevenday
[Hart] move site-logo scss to one place
[Hart] header fixes
[Hart] fix jagged green box on mobile view

On mobile, the default brand doesn't have the box extend to the
"locate me automatically", so we use that same behaviour, setting
the hart primary box only on media query.
[Hart] fix recent photos box in Local Alerts
[Hart] footer work including social media icons
[Hart] fix alerts page width on desktop view