SYNTAX: Add classes in prep for Topic list refactor (#69)

* DEV: Prep for topic-list refactor

assets/javascripts/discourse/templates/components/docs-topic-list.hbs

@@ -1,7 +1,7 @@
 {{#load-more selector=".topic-list tr" action=loadMore}}
   <table class="topic-list">
-    <thead>
-      <th role="button" {{action "sortListTitle"}}>
+    <thead class="topic-list-header">
+      <th role="button" class="topic-list-data" {{action "sortListTitle"}}>
         {{i18n "docs.column_titles.topic"}}
 
         {{#if sortTitle}}
@@ -13,7 +13,7 @@
         {{/if}}
       </th>
 
-      <th role="button" {{action "sortListActivity"}}>
+      <th role="button" class="topic-list-data" {{action "sortListActivity"}}>
         {{i18n "docs.column_titles.activity"}}
 
         {{#if sortActivity}}
@@ -26,7 +26,7 @@
       </th>
     </thead>
 
-    <tbody>
+    <tbody class="topic-list-body">
       {{#each topics as |topic|}}
         {{raw "docs-topic-list-item" topic=topic}}
       {{/each}}

assets/javascripts/discourse/templates/docs-topic-list-item.hbr

@@ -1,5 +1,5 @@
-<tr>
-  <td class="main-link">
+<tr class="topic-list-item">
+  <td class="main-link topic-list-data">
     <span class="link-top-line">
       {{~raw "topic-status" topic=topic}}
       {{~raw "docs-topic-link" topic=topic}}
@@ -9,7 +9,7 @@
       {{discourse-tags topic mode="list"}}
     </span>
   </td>
-  <td>
+  <td class="topic-list-data">
     {{format-date topic.bumped_at format="tiny" noTitle="true"}}
   </td>
 </tr>