Revert "sass: add styles for twitter/mailchimp subscriptions; hide paypal amounts on mobile."

This reverts commit 52d78afb39bad990c36aee0202558cc0e0497bab.
Revert "templates: remove splash text with twitter/mailchimp subscriptions."

This reverts commit e7fc18fae2154c97195fba91f1b7d37ad5b553d9.
assetgen: include fitvids in jslibs.
style: paras should have a bottom margin.
community: add constitution doc to community page.
index: swap the ted video in.
community: fix link to constitution pdf.
docs: update the constitution.
layout: add @wikihouse to secondary nav.
community: hack in a embed google group.