Clean up devanagari/consonants
Clean up two lessons in Roots
Clean up many lessons in Roots

This consists of:
- fixing typos
- fixing mistranslations
- using more varied vocabulary in examples
- rewriting some sentences and paragraphs
- expanding on a few points
Add first draft of roots/review
Fix JavaScript bugs for settings store
Fix JavaScript bugs for settings store [retry]

I forgot to add core.js.
Clean up some lessons in Devanagari

More specifically:
- use the correct symbol for 'om'
- reword some sentences
Move and modify sidebar

Sidebar now sits on the left side of the screen. It's thinner and more
compact. And it's a fair sight more readable, too.
Update index pages for guide and units

These pages use the sidebar and are more substantial than before.
Add CSS for call to action

It's a big green button!
Update site index

It isn't perfect, but it's much better than what it was before.
Add link to go to previous lesson

Also, mark the lesson titles as safe.
Modify nav and masthead CSS

For ease of use, the main nav should appear on each page, including the
main page. The usual nav looks terrible against the masthead, so I
changed some CSS. The result is more attractive than before but could
still use some work.
Fix error in roots/ta

Fix 'karizye' to 'kariSye' and clean up the translation.