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This PR adds all the appropriate meta tags to pages. This makes will improve SEO and improve previews in services like Slack, which uses both Twitter and Facebook/OpenGraph data for its "unfurling".
Example
These meta tags are currently in use on the GOV.UK developer docs. They cause Slack to show a nice preview, unlike other sites like the PaaS tech docs:
Part of the Q4 GOV.UK 🔥 firebreak: https://trello.com/c/QbspvRc2