Remove IPNS support and related content

Deleted IPNS view, content, and asset files. Removed references to IPNS from the README, sidebar, and documentation pages. This feature is no longer supported for hosting.

components/sidebar.html

@@ -302,15 +302,6 @@
               />
               <span class="sidebar-text">Links</span>
             </a>
-            <a href="#view=ipns" class="sidebar-nav-link sidebar-nav-link--sub" title="IPNS">
-              <img
-                src="assets/svg/ipns-icon.svg"
-                alt=""
-                aria-hidden="true"
-                class="sidebar-icon"
-              />
-              <span class="sidebar-text">IPNS</span>
-            </a>
             <a
               href="#"
               data-dns-link