Fix blog feed escaping of unicode characters
The pattern correctly matches the unicode characters, but
should not be saving the u character in the group. Otherwise the output
is something like &#xu00e9; which is invalid and ends up rendering as
those plain characters rather than the expected é which is é
Remove the .slice(0, 3) from js/blog-feed.js to see more articles
if the recent ones do not display the above issue.
Navigate to localhost:4000 and see the feed rendering unicode characters correctly.
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D7465