Update theme validation to minima for config.yml

update bug report template

remove remaining references to default themes

remove pdf link because at this point its very wrong

resolve conflicts

edits

Merge pull request githubtraining#17 from githubtraining/ghes-install…

…-notes

Add install notes for GitHub Pages

move up pages dep, add an alternative

Merge pull request githubtraining#16 from githubtraining/fix-url

Fix URLs

Add install notes