first pass at /community guidelines
improve instructions for adding institutions

via https://github.com/github/government.github.com/pull/74/files#r7017437
Add IATI to organizations list
Fixing instructions, part deux
Update community.md
Update readme.md.
Remove unused IDs.
Remove unneeded quotes.
Remove the unused package.json.
Fix footer links with low resolutions.

Hide them like it was done before, but cover all low resolutions now.
Fix selector name.
Fix :not selector.
Update modernizr.js to v2.7.0.
Refactor the <head> entries.
Remove the "root" config option.

It wasn't being used consistently across all files and it's much shorter to use "/" directly, anyway.
Remove unneeded end tags.
Update front matter hypen spacing
Update Respond.js to v1.4.0+.
Add Open Courts to the organization list
Merge pull request #212 from otvorenesudy/gh-pages

Add Open Courts (Otvorené Súdy in Slovak)