Add RDFa reference to Wikidata

templates/footer.html

   <div class="columns is-multiline" resource="https://teckids.org/" typeof="schema:Organization">
+    <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>
       <address property="schema:address" typeof="schema:PostalAddress">