updating h1 tags for accessibility

fixes CNVS-15104

test plan:
- visit edited pages from spreadsheet below
- test page headings with screenreader in safari
- pages should have level 1 headers for screenreader that proceed in order logically
- compare top level headers on assignments, modules, syllabus, and wiki pages
bewteen their actual pages, and their pages when called from home page selection
- headers for the above pages should be h1 on their respective pages, and h2
when called from home page, and stll proceed logically

Changes need to be tested on the following pages
default home page (/)
home page set to course modules
home page set to front page
home page set to assignments list
/courses/1
/courses/1/assignments
/courses/1/assignments/new
/courses/1/assignments/1/edit
/courses/1/discussion_topics/new
/courses/1/discussion_topics/1
/courses/1/discussion_topics/1/edit
/courses/1/gradebook#tab-assignment
/courses/1/gradebook/speed_grader(just pick any assignment w/ speedgrader)
/courses/1/groups
/courses/1/user_services
/courses/1/pages/(whatever page for course)
/courses/1/quizzes/1/edit
/courses/1/quizzes/1/take?preview=1
/courses/1/question_banks/2
/courses/1/quizzes/1/take
/courses/1/conferences
/courses/1/modules/progressions
/calendar2
/about/1
/profile/settings
/dashboard/eportfolios
/conversations?#filter=type=inbox
/accounts/1
/accounts/1/users
/accounts/1/sub_accounts
/accounts/1/account_authorization_configs
/accounts/1/groups
/accounts/1/users/2
/accounts/1/permissions
/accounts/1/avatars
/users/2/user_notes
/accounts/1/rubrics
/accounts/1/grading_standards
/accounts/1/user_notes
/accounts/1/admin_tools
/users/1/admin_merge
/users/1/teacher_activity/student/1
/users/1/masquerade

Change-Id: Ifdad341a22631c0d6773977743be741e74fecd88
Reviewed-on: https://gerrit.instructure.com/40370
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Simon Williams <simon@instructure.com>
QA-Review: Sean Lewis <slewis@instructure.com>
Product-Review: Aaron Cannon <acannon@instructure.com>