FLUID-5451: External link icons and content
- added external link icons
- added GPII to projects
- skip links now jump to content and nav
- updated readme.
FLUID-5451: Updated documentation link.
Merge remote-tracking branch 'jon/FLUID-5451' into FLUID-5520

Conflicts:
	src/layouts/default.html.hb.eco
FLUID-5520: Final tweaks to styling for UIO integration