new styles and code for right panel toggle
move font-awesome include earlier so it can be used anywhere
smaller sidebar toggle with animation
fix handling of POD error display

Classes on <p> elements are now being stripped, so we can't use them to
select the heading of the error block.
small refactor of pod error css to improve display
Updates CONTRIBUTING.md with coding conventions.
Merge pull request #1374 from haarg/panel-toggle-revision

new styles and code for right panel toggle
try harder to override syntax highlighter fonts
Recommend a simpler interactive rebase workflow.
add right panel toggle to release page
Add content to coding conventions.
fix markup on source page
add metadata about page
fix typos in metadata page