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
Edited by Otto Visser