Removed superfluous "a"
Add distinct page titles

Should have better SEO properties in terms of being easier to understand
what each page is about in SERPs.
Merge pull request #171 from alphagov/page-titles

Add distinct page titles
Add explicit GOV.UK in the design principles title

https://www.google.co.uk/search?q=design+principles gives a first result
with ‘GDS design principles - Gov.UK’ listed. 

Obviously Google don’t understand that we’re capped
up since we mean business!
Service manual updates version-96

https://github.com/alphagov/government-service-design-manual/compare/version-95...version-96