additional sidebar navigation and removed some elements from main content window

src/registrar/templates/home_organizations.html

@@ -13,19 +13,24 @@
             {% block messages %}
                 {% include "includes/form_messages.html" %}
             {% endblock %}
+            {# Note: Reimplement commented out functionality #}
+            <!--
             <h1>Manage your domains</h1>
+            -->
 
             {% comment %}
             IMPORTANT:
             If this button is added on any other page, make sure to update the
             relevant view to reset request.session["new_request"] = True
             {% endcomment %}
+            <!--
             <p class="margin-top-4">
             <a href="{% url 'domain-request:' %}" class="usa-button"
             >
                 Start a new domain request
             </a>
             </p>
+        -->
             {% if content == 'domains' %}
                 {% include "includes/domains_table.html" with portfolio=portfolio %}
             {% elif content == 'domain-requests' %}

src/registrar/templates/organization_sidebar.html

@@ -16,6 +16,21 @@
            Domain requests
         </a>
       </li>
+      <li class="usa-sidenav__item">
+        <a href="#">
+          Members
+        </a>
+      </li>
+      <li class="usa-sidenav__item">
+        <a href="#">
+          Organization
+        </a>
+      </li>
+      <li class="usa-sidenav__item">
+        <a href="#">
+          Senior official
+        </a>
+      </li>
     </ul>
   </nav>
 </div>