Added a rough and ready ZA PMG header

towards #747
Took content from the sample page layout and put into templates. Still requires styling
Updated sample html with output from templates so that Jed can style it correctly
Delete old sample html file
Rename sample html for clarity (both file and dir)
Updated CSS for the new menu html

A lot messier because of the overrides, and for some reason the entire menu disappears on small screens. Guessing this is inherited from the main mz menu where it is replaced with a menu button.
Change all links in PMG menu to be absolute to the pmg.org.za website
Change all links in PMG header to be absolute to the pmg.org.za website
Remove now redundant design html
Merge branch 'issues/747-za-pmg-header'