more robust id naming
Correcting sticky nav link locations & element IDs
Merge pull request #372 from gocardless/french-pro-correct-hashes

Correcting sticky nav link locations & element IDs on /fr/pro
minor nomenclature changes and tagging an <a> not <div>
corrects id name for pro CTA
Merge pull request #371 from gocardless/switch-to-enhanced-link-attribution

more robust id naming
Correcting link tracking IDs
Correcting /merchants/new link tracking ID
Merge branch 'dev'