A lot :)

app/views/link_categories/_link_category.html.erb

@@ -6,7 +6,7 @@
 
   <p>
     <strong>Description:</strong>
-    <%= link_category.description_html %>
+    <%= link_category.description %>
   </p>
 
 </div>

app/views/link_categories/_link_category.json.jbuilder

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 json.extract! link_category, :id, :name, :description, :rich_text, :created_at, :updated_at
 json.url link_category_url(link_category, format: :json)

app/views/link_categories/index.html.erb

@@ -18,7 +18,7 @@
         
           <td><%= link_to(link_category.name, url_for(link_category)) %></td>
         
-          <td><%= link_to(link_category.description, url_for(link_category)) %></td>
+          <td><%= link_to(truncate(link_category.description.to_plain_text), url_for(link_category)) %></td>
       </tr>
     <% end %>
   </tbody>

app/views/link_categories/index.json.jbuilder

@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 json.array! @link_categories, partial: "link_categories/link_category", as: :link_category

app/views/link_categories/show.json.jbuilder

@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 json.partial! "link_categories/link_category", link_category: @link_category