Due to the order we were parsing markdown, bbcode [url] elements were not
handled properly.
`[url]https://example.com/path[/url]` was not currectly parsing cause
linkify was detecting the url as: `https://example.com/path[/url]` which is
legit.
To resolve this I swapped url to use a replace rule, and instead re-parsed
the internal payload and injected the tokens in.
This fix is complex cause we support stuff like
`[url][b]test.com[/b][/url]`
So we need to parse the content inside url `[b]test.com[/b]`
fd4aea7bc5