website: the contact pages' header no longer slides under the sidebar

kapcsolat.html and en/contact.html keep their page header OUTSIDE <main>. Left
there, the converted header became a FLEX SIBLING of the sidebar: measured, it
took 401px and pushed .content from x=240 to x=642, so the header sat behind the
sidebar and the form rendered at two thirds width.

Anything before <main> now moves inside it. Checked structurally across all 19
pages rather than by looking at two: no page has stray top-level content, and
every .content starts at x=240 with the full 1185px column.

Found by measuring where elements actually sit, after a screenshot looked wrong -
the same check also confirmed the two elements at x=-9999 on those pages are the
form's intentional spam honeypot, not a layout fault.

website/preview/m3/en/testing.html

@@ -88,9 +88,7 @@
             </div>
         </div>
     </nav>
-
-
-    <main class="content">
+<main class="content">
                 <div class="page-header">
                 <h1>Become a <span>tester</span></h1>
             </div>