Initial scroll depth module logging depth corrrectly
Add content tracking to scrollDepth
Working scroll depth logging
Add unit test for scrollDepth module
Hook up scroll depth module with ophan record call
Fix spacing
Add feature switch for scroll depth
Amend switch text
Opengraph image will now display the trail image if there is no main picture
Merge pull request #3048 from guardian/og-image

Opengraph image will now display the trail image if there is no main picture
Defend against divison by 0
Merge branch 'scroll-depth' of github.com:guardian/frontend into scroll-depth
Merge pull request #3044 from guardian/scroll-depth

Scroll depth measurement
Icon is held properly in show more container button - fixes #3049
Remove FaciaHealthcheckTest for the time being
Merge branch 'remove-facia-healthchecktest'
Add swicth for rainbow logo
Add guardian rainbow logo and feature switch
Merge pull request #3051 from guardian/rainbow

Rainbow logo!!!!
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