Revert "Fix failing API test"

This reverts commit adcbf8aae1262221e2ab16af5b47754f93045c48.
Revert "Move /api/search -> /api/annotations"

This reverts commit 9e64b55eb2b5adcde0807e95a12eeedcd2a7a05b.
Update CONTRIBUTING.rst

Update CLA links to use Wordpress uploads.
Take spare quotation mark for my personal collection
Remove apparently dead code in thread.coffee

I can't find any behaviour difference with this code removed. Threads
are correctly collapsed and uncollapsed when the search is changed or
cleared.
Simplify applyUpdates
WIP: flash annotation cards when updated

This is a proof of concept to demonstrate flashing annotation
cards when updates arrive via the websocket.