css: eliminate dead css.

app/javascript/src/styles/specific/admin_dashboards.scss

@@ -1,5 +0,0 @@
-#c-admin-dashboards {
-  .section {
-    margin-bottom: 2em;
-  }
-}

app/javascript/src/styles/specific/api_keys.scss

@@ -1,5 +0,0 @@
-#c-maintenance-user-api-keys {
-  .button_to {
-    display: inline-block;
-  }
-}

app/javascript/src/styles/specific/bulk_update_requests.scss

@@ -1,9 +0,0 @@
-#c-bulk-update-requests {
-  s.approved {
-    color: var(--bulk-update-request-approved-color);
-  }
-
-  s.failed {
-    color: var(--bulk-update-request-rejected-color);
-  }
-}

app/javascript/src/styles/specific/explore.scss

@@ -1,19 +0,0 @@
-div#c-explore-posts {
-  header {
-    text-align: center;
-
-    h1 {
-      font-size: 3em;
-    }
-
-    p.byline {
-      font-size: 1.2em;
-      font-style: italic;
-    }
-  }
-
-  div.posts {
-    padding: 1em;
-    margin-bottom: 2em;
-  }
-}

app/javascript/src/styles/specific/meta_searches.scss

@@ -1,5 +0,0 @@
-#c-meta-searches {
-  section {
-    margin-bottom: 2em;
-  }
-}

app/javascript/src/styles/specific/related_tags.scss

@@ -32,28 +32,9 @@ div.related-tags {
       max-width: 45em;
     }
 
-    ul {
-      margin: 0;
-
-      li {
-        em {
-          font-weight: bold;
-        }
-
-        svg {
-          margin-top: 2px;
-          cursor: pointer;
-        }
-
-        a {
-          min-width: 3em;
-        }
-
-        a.selected {
-          background: var(--selected-related-tag-background-color);
-          color: var(--selected-related-tag-color);
-        }
-      }
+    a.selected {
+      background: var(--selected-related-tag-background-color);
+      color: var(--selected-related-tag-color);
     }
   }
 }