Change Table of Contents -> Outline
Add appropriate highlight.js classes to code blocks
Defragment presentation

I used a lot of fragments, but I think it could get distracting. Remove
a lot of them.
Fix typo: comitting -> committing
Add sections for merge conflicts
Update speaker notes for .gitignore
Quotes -> <code></code>
Add another Git bad practice

Referring to shitty commit messages
Add questions slide
Revise subheader for Git ninja section
Remove commented plugins