DEVELOPER-1006 Freemodeler t&c

* Also fix issue where image: is interpreted specially in
asciidoc
DEVELOPER-1147 Replace default microsite branding image on FreeModeler microsite.

Conflicts:
	_layouts/freemodeler.html.slim
	_layouts/microsite.html.slim
Merge pull request #697 from paulrobinson/DEVELOPER-1006

Freemodeler: Ts&Cs and hero image