Add more examples to full-page slides
Update imports for curriculum SASS dependencies
Update three-stage thinking diagram segments
Separate three diff states
Move command description within code block
Separate build-steps for commit version steps
Add `diff` commands after each diagram
Add git diff for path example slide
Prefix command line "description" with `#`
Add slides for `log`, option switches
Add branch command slide
Prefix shell blocks with "$"
Add branch command line slide examples
Adjust slide `pre` for contrast, bolder apperance
Break section title to two lines for clarity
Add sub-heading for additional merge details
Merge pull request #280 from github/intermediate-updates

Intermediate curriculum updates