Render machine correctly if it doesn't contain @

Dependencies

• [2] 2GUAKGTB Fix indentation of build.tt
• [3] 6GEU36HW Remove obsolete CSS classes
• [4] BIVZGPUT Optimise clickable rows
• [5] JGLE5BRN Add separate build step status codes for cached failures and timeouts
• [*] J5UVLXOK * Start of a basic Catalyst web interface.

Change contents

• replacement in src/root/build.tt at line 43
  [2.932]→[2.932:985](∅→∅)
  − <td>[% step.machine.split('@').1 %]</td>
  [2.932]

  [2.985]
  + <td>[% step.machine.split('@').1 || step.machine %]</td>