Add logo to footer and microdata

templates/footer.html

@@ -2,8 +2,11 @@
   <meta property="rdfs:seeAlso" href="http://www.wikidata.org/entity/Q122507357" />
   <div class="column is-one-fourth">
     <p class="title is-5" property="schema:name">Teckids e.V.</p>
+    <figure class="image">
+      <img src="{{ get_url(path="artwork/logo-teckids.svg") }}" alt="Teckids-Logo" property="schema:logo" />
+    </figure>
     <address property="schema:address" typeof="schema:PostalAddress">
-      <span property="schema:streetAddress">{{config.extra.footer.address.street|safe}}</span><br/>
+      <span property="schema:streetAddress">{{config.extra.footer.address.street|safe}}</span>&nbsp;·&nbsp;
       <span property="schema:postalCode">{{config.extra.footer.address.postal_code|safe}}</span>&nbsp;
       <span property="schema:addressLocality">{{config.extra.footer.address.city|safe}}</span>
     </address>
@@ -20,7 +23,7 @@
           <figure class="image">
             <meta property="schema:name" content="{{sponsor.alt}}" />
             <a property="schema:url" href="{{sponsor.link}}">
-              <img src="/images/sponsoren/{{sponsor.logo}}" alt="{{sponsor.alt}}" />
+              <img src="/images/sponsoren/{{sponsor.logo}}" alt="{{sponsor.alt}}" property="schema:logo" />
             </a>
           </figure>
         </div>