Add demo 404 page
Remove my email from the footer.

That worked fine when we had 200 people on the site every day. Not so much when we have 100k in a day.
Add links to getting started page
Add copy to homepage

Focus on practice/mentorship. It's not about learning. Not about teaching.
Fix exercism/exercism.io#1901 broken links in commit 331ba1c72ddbec0080c358585965b4f59f733ed4a

Haml is not MarkDown.
Fix broken link. Closes #1901
Merge pull request #1902 from janderse/master

Fix exercism/exercism.io#1901 broken links
Add bios to about page
Fix CLI installation instructions. Fixes #1912
Fix broken markup in submissions#show

Markup broke when submission included <object>
Merge pull request #1916 from Phazz/fix_broken_markup

Fix broken markup in submissions#show
Add missing (upcoming) languages. Fixes #1810
Delineate sections on about page
Reorder about page
Clarify CLI config instructions

A lot of people copy/pasted the configure command, including the --dir=/path/to/exercism.
Oops.
Tweak homepage text
Tweak readme
Inline method
Only notify users mentioned in current submission. Fixes #1727
Upgrade rouge. Fixes #1911