Remove close button on news items since it's not persistent, so kinda useless

Dependencies

• [2] OEPUOUNB Using twitter bootstrap for more consistent looks for Hydra
• [3] ZWCTAZGL added newsitems, added some admin options to clear various caches.
• [*] ODNCGFQ5 * Improved the navigation bar: don't include all projects (since that

Change contents

• edit in src/root/overview.tt at line 6
  [2.7632]→[2.7632:7685](∅→∅)
  − <a class="close" data-dismiss="alert">×</a>