Move links from _metadata partial into new partial

This is in preparation for including the metadata links in the footer.
Initial document_footer_meta on publications
Add change notes to document footer
Fix document footer padding on mobile
Add document meta footer to consultations
Add document meta footer locales
Fix metadata in strong tag not being bold
Style show other content link correctly in footer metadata

This is styled the same as the other links, but might be too prominent. Perhaps it could be normal weight / smaller.
Include document footer on all other document types

Except policies – see https://www.pivotaltracker.com/story/show/49121251