Post-deploy configuration tasks

[benlk]

This list should include every configuration change made on staging, to be performed on production once the task is live.

• re-enable sticky social share buttons
• re-enable the donate button in the global nav (Add Donate button to the top of story pages in the sticky nav, in a way that does not collapse to the "More" menu. #10)
• change Donate button label to "Donate"
• update to latest Largo when available.