Add meta description
Add meta description

Adds a meta description to all pages, based on the Open Graph meta
desciption.  Also changes the date to 18th September to reflect this
year's ride.

Techbikers/techbikers,mwillmott/techbikers,Techbikers/techbikers,Techbikers/techbikers,mwillmott/techbikers,mwillmott/techbikers,Techbikers/techbikers,mwillmott/techbikers