Modernizing our Topic List HTML - preparing themes, components and plugins

thanks for introducing these changes! just double-checking before I adjust declarations..

the markup is:

<table>
  <thead>
    <tr>
      <th>
  <tbody>
    <tr>
      <td>

and respective classes are/will be:

.topic-list
  .topic-list-header
    (tr will be dropped here?)
     .topic-list-data
  .topic-list-body
    .topic-list-item
      .topic-list-data
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