Merge pull request github#244 from github/js-fine-tuning

JavaScript tune up, logic improvements

Release script tests for build success

Merge pull request github#100 from github/found-int-workbook-tuning

Foundations, Intermediate Workbook content tuning

Merge pull request github#98 from github/cheat-sheet-ja

Add JA Translation of Git Cheat Sheet

Update grammer and small text formatting

Update PDF to latest content release

Merge pull request github#9 from github/fix-slide-links

Fallback to tab-toggle with visibility due to browser opacity issues