Remove references to #brand

This will be superceded by organisation-specific CSS styles.
Replace brand div with organisation logos

These logos will match the ones currently on Inside Government.

This implements the MOD logo (black bar) for the time being. They need
to be genericised in further iterations.
Default to the organisation (CO) crest
Add organisation-specific branding

This includes colours where required and the respective crests for the organisation.
Hook up organisation-specific branding
Replace crests with higher-res equivalents and increase org logo size
Align organisation logo with top h2 title
Refer to the correct YAML field
Provide branded titles for organisations

When using the larger logo format, certain organisations need their
names to be presented in a specific way. This is now provided in the
site configs.
Place page_title inside of #detail div

Keep all of the content-related items together.
Strip away .inner widths to be just raw components
Simplify element margins so that @media changes aren't required
Don't bother with a brand title for larger org logos

These will get messy very fast and confusing for people working on the
redirector. It's easier to use the single-line organisation logo and
means the current workflow for the Inside Government team doesn't need
to change.
Add mobile-size images for organisations

When at 640px width or lower, show the smaller organisation logos.
Provide better values (exact over decimal) and set low-res org images

These values were set to decimals with their respective values in
pixels next to them. Rather than cause confusion later, it's easier to
set these to the explicit values.

Also applied the organisation images when viewing on mobile.
Provide some fixes for oldIE

Things like max-width don't work under older IE version, so handle
them correctly here.
Defaults to no branding if the CSS field isn't set

After a discussion with Pete it was agreed that having a default crest
and CO line would cause confusion when the agency moves start happen.
Instead, we're just showing the plain text for the time being for redirects.
Provide text offsets as not all crests are the same width
Provide organisation CSS for home office
Add DECC branding for subdomains