Added five more events with descriptions frm Blades
Youtube OR html5 made consistent
Added change log entry for PR3728
Anton's and Sylvia's edits
Anton's edit, date change
Disable cms test due to failure on master build.
fixing drag and drop
support aria-grabbed and aria-dropeffect
Reorganized, updated, & streamlined sections in Running Your Course
Merge pull request #3818 from edx/ahodges/documentation/DOC368

Ahodges/documentation/doc368
Addressed review feedback.
Adaptive hint correct_answer must be lc
Merge pull request #3798 from edx/ahodges/documentation/DOC402

Adaptive hint correct_answer must be lc
Merge pull request #3796 from edx/benpatterson/disable-course-export-acc-test

Benpatterson/disable course export acc test
Merge pull request #3790 from edx/ahodges/documentation/DOC156

Ahodges/documentation/doc156
Merge pull request #3802 from louyihua/translation-fix

i18n: Make checklists translatable
Merge pull request #3254 from edx/dcs/a11y-dragdrop

This fixes a few accessibility problems with drag and drop
Set up for new Open edX Installation and Operations Guide

doc-389
Modified description of transcript bug fix

As well as updated the index page for usability
Merge pull request #3800 from edx/markhoeber/documentation/release-notes-fix

Modified description of transcript bug fix