Remove all client-side validation and rely on server-side validation

Gives better error messages to the user.

view/src/main/java/se/su/dsv/scipro/match/ProjectIdeaSubmissionPanel.html

@@ -17,7 +17,14 @@
         an idea if you couldn't find any suitable supervisor provided ideas.
     </div>
 
-    <form wicket:id="ideaForm">
+    <!--
+        Turn off all client-side validation using novalidate.
+        All input is validated server-side, and we want to validate it
+        that way to get nice error messages.
+        However, we also want to maintain the required/minlength/whatever
+        attributes on the input fields for accessibility.
+     -->
+    <form wicket:id="ideaForm" novalidate>
         <div class="mb-3">
             <label class="col-form-label" wicket:for="title">Title</label>
             <p class="form-text">