Merge pull request #2719 from edx/markhoeber/documentation/stud-1314

...s/course_authors/source/Images/HTML_Insert-Edit_Image.png

docs/en_us/course_authors/source/Images/HTML_Link_File.png

docs/en_us/course_authors/source/Images/file_pagination.png

docs/en_us/course_authors/source/Images/file_sort.png

...en_us/course_authors/source/Images/files_uploads_urls.png

docs/en_us/course_authors/source/Images/image_link.png

docs/en_us/course_authors/source/change_log.rst

docs/en_us/course_authors/source/create_html_component.rst

docs/en_us/course_authors/source/create_new_course.rst