CSS : Various of modifications and several fixes;

Python : Improve caching system;
Python : Support XEP-0292: vCard4 Over XMPP (Thank you. Marvin W);
SVG    : Add new icons, including characters as temporary placeholders (Thank you. Tigase);
TOML   : Add more systems and modify properties of clients;
XHTML  : Improve design and add a new page of extended vcard.

xhtml/node.xhtml

@@ -76,14 +76,10 @@
                       </div>
                     {% endif %}
                     <div class="link">
+                      <a href="{{entry['href']}}">Source</a>
                       <a href="/d/{{jid_bare}}/{{node_name}}/{{entry['id']}}"
                          title="Permalink (i.e. permanent link)"
-                         class="permalink">
-                        🔗️
-                      </a>
-                      <a href="{{entry['href']}}">
-                        {{entry['title']}}
-                      </a>
+                         class="permalink">Permalink</a>
                     </div>
                   </div>
               {% endfor %}