Fix errors and warning of w3c validator

This MR addresses two things:

• weird edit in a header that should be removed
• Queue has static analysis for Java, but not for CSS or HTML. I experimented with giving the production URL to the w3c validator and fixed the errors/obsoletions the validator noticed.

Future work:

• think about CSS/HTML/JS checks in the Labrador pipelines
• TODO: Error: html footer has a footer in it
• TODO: Error: html header has a header in it

src/main/resources/templates/lab/enqueue.html

@@ -8,7 +8,7 @@
     published by the Free Software Foundation, either version 3 of the
     License, or (at your option) any later version.
 
-    This program is di•••••••••••stributed in the hope that it will be useful,
+    This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Affero General Public License for more details.