Outage pages cleanup

• Remove outdated exclamation mark image and replace it with more modern looking icon created by a designer at DoIT Comm
• Delete unused simple.js file, that included outdated/unused code
• Add missing html language specification
• Remove inline style code and add reference to the styles included in a stylesheet file
• Add missing alt text to the UW Logo
• Heading level fix
• Fix alignment of items in header on mobile view

myuw-root-webapp/src/main/webapp/403.html

@@ -14,7 +14,7 @@
 		<header class="mdl-layout__header">
 			<div class="mdl-layout__header-row">
 				<div class="photo-div">
-					<img src="/main_logo_w_all.png" alt="University of Wisconsin System Logo" class="crest">
+					<img src="/main_logo_w_all.png" alt="University of Wisconsin System Logo" class="uw-logo">
 				</div>
 				<!-- Title -->
 				<h1 class="mdl-layout-title outage-title">Access Denied</h1>
@@ -26,8 +26,8 @@
 				<div class="mdl-cell mdl-cell--8-col mdl-cell--10-col-phone">
 					<img src="/alert-icon.png" alt="Line art image of an exclamation mark inside of a triangle" class="alert-icon">
 					<h2 class="mr-title">Sorry, you're not authorized to access this page.</h2>
-					<p class="centered">If you're here by accident, head back to your MyUW <a href='/web'>homepage</a>.</p>
-					<p class="centered">For help with authorization, contact the DoIT <a href="https://kb.wisc.edu/helpdesk/">Help Desk</a>.</p>
+					<p>If you're here by accident, head back to your MyUW <a href='/web'>homepage</a>.</p>
+					<p>For help with authorization, contact the DoIT <a href="https://kb.wisc.edu/helpdesk/">Help Desk</a>.</p>
 				</div>
 				<div class="mdl-cell mdl-cell--2-col mdl-cell--1-col-phone"></div>
 			</div>