Make the left margin more consistent.

Previously, the title and tagline were pushed right while the liveupdate
table itself was all the way left. This looked crappy.
Remove border between sidebar elements when no description.

Previously, the sidebar had a border between the description area and
the "discussions" area regardless of whether or not the description
actually had content. This looked silly on a minimal page.
Replace "show more" button with infinite scrolling.
Apply event timezone to the time detail title-text.
Make timestamps more specific as temporal context fades.

Fixes #6.
Make initial separator clearer when event is complete.
Improve the look of the empty listing message.
Reload page when inserting new update and no listing present.

Fixes #2.