Add helper class for figuring out whether a link is external
Add fallback for external urls breaking
Add CSS class to cards that are external links
Make 'external' a tone, not modifier class
make sure checking the right bit
add link icon
add tone colours
update pastup palette
Add OG site name as byline. Relativise on-site urls.
Use CORS list for domains
Merge branch 'external-links' of github.com:guardian/frontend into external-links
Merge pull request #7267 from guardian/external-links

External link styling