In search results, apply overflow-wrap: break-word; to URLs

[benlk]

Given a URL whose length between the first character and the first hyphen is longer than the text column is wide, we need to make sure that wraps at the end of the column rather than overflowing.

https://github.com/INN/largo/blob/62127383aae0e070883c4f915016582d14191535/partials/content-search.php#L20-L24

• adding overflow-wrap: break-word; to the a tag will do it, but it needs to be scoped to the search result markup in partials/content-search.php.
• If the URL is always going to be longer than the date, could we also get rid of the .sep separator and just have the date and URL be on separate lines?

[joshdarby]

@benlk This is ready for review in #1710.