Footer enhancements

[jamesgeddes]

Create a footer section that shows on every page. Like the ones seen at ncvo.org.uk and python.org.

I have put together a draft layout in gslides. It is not a suggested design, but just includes the required content. Do make it more aesthetically pleasing.

Logos & links are listed on this spreadsheet.

Impact

High

Urgency

Now

[tbentham]

Renamed to avoid confusion with #265.

[anthonyiu]

/mine