Split the description sidebar into description and resources.

The (low length limit) description field will be useful for embeds and
for summarizing the thread. Resources will become collapsable
eventually.
Add OpenGraph data to the live pages.
Add the description to meta property=description.
Add rel="nofollow" to user-generated links.
Clean up CSS rules.

* get rid of some unnecessary nesting
* pull out various stuff into variables
* make the selector for the header more obvious
Add permalinks for individual updates.

This just shows the linked update for now without surrounding updates
for context.