fix: use root-relative feedback link

CHANGELOG.md

@@ -4,6 +4,9 @@
 
 + Label the root 403 error page with error code MYUW-002.
 + Label the root 404 error page with error code MYUW-003.
++ Use root-relative link to feedback so that feedback remains in correct hostname
+  (so, in my.wisc.edu the feedback link will be to my.wisc.edu,
+  but in my.wisconsin.edu the feedback link will be to my.wisconsin.edu)
 
 ## 1.1.15 and earlier
 

myuw-root-webapp/src/main/webapp/404.html

@@ -30,7 +30,7 @@
 					<h2 class="mr-title">Sorry, the page you are looking for does not exist or you don't have access to it.</h2>
           <p>Please go to the <a href='/'>MyUW home page</a>.</p>
 					<p class="apologize">We apologize for the inconvenience. If you feel as though this URL should exist, please drop
-						us a line on our <a href='https://my.wisc.edu/portal/p/feedback'>feedback form</a>. When offering feedback or contacting the Help Desk, please mention <strong>MyUW error code MYUW-003</strong>.</p>
+						us a line on our <a href='/portal/p/feedback'>feedback form</a>. When offering feedback or contacting the Help Desk, please mention <strong>MyUW error code MYUW-003</strong>.</p>
           <p>(Technical detail: HTTP status code 404 NOT FOUND presented by root servlet context.)</p>
 				</div>
 				<div class="mdl-cell mdl-cell--2-col mdl-cell--1-col-phone"></div>