More accessibility updates suggested by Greg Kraus
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Moved h1 style changes from bootstrap.css to math4.css
Merge branch 'release/2.8' of https://github.com/aorinevo/webwork2 into reaccess

Conflicts:
	htdocs/js/vendor/bootstrap/css/bootstrap.css
Merge pull request #238 from goehle/reaccess

Accessability