migrates portions of the user manual to 1.5

- migrates block sections
- creates block includes
- migrates pass sections
- migrates lists sections
- migrates text sections
- migrates table sections
- combines table includes
Merge pull request #256 from graphitefriction/1-5-docs

migrates portions of the user manual to 1.5
revisions to 1.5.0 release notes & announcement
use bundle exec when calling awestruct; use Asciidoctor master
use https where applicable
load MathJax in footer if page-stem is set
revert test block from migration page
use bundle exec locally
use attribute ref to refer to github.com
add primary class to main content
enable stem on 1.5.0 release announcement
update stylesheet to use default theme from upstream
update README / index page from upstream
additional updates to stylesheet
wrap link label in quotes
upgrades quick ref to 1.5
Merge pull request #257 from graphitefriction/1-5-docs

upgrades quick ref to 1.5
migrates user manual sections to 1.5

- admonitions
- listing blocks
- literal blocks
- hr
- open blocks
- excerpt, quote, and verse blocks
- sidebar
- example blocks
- creates page break include
- consolidates alternative quote syntax includes
Merge pull request #258 from graphitefriction/1-5-docs

migrates user manual sections to 1.5
migrates multi-media sections of user man to 1.5

- images
- icons
- video
- audio
- ui
- callouts
- source blocks
- combines include files for ui
- combines include files for video
- combines include files for image positioning