Replaced the Twitter examples with ISSN and ROR

Author: egonw

scholia/app/templates/index.html

@@ -158,12 +158,11 @@ <h4 class="my-0 font-weight-normal">Redirects</h4>
       <p>If you know the external identifier of a concept, then Scholia can make a lookup based on it:</p>
 
       <dl>
-	<dt><a href="twitter/utafrith">twitter/utafrith</a></dt>
-	<dd>Look up by Twitter username @utafrith. This will identify
-	  the London-based researcher Uta Frith and redirect to her Scholia page.</dd>
+	<dt><a href="issn/2050-084X">issn/2050-084X</a></dt>
+	<dd>Look up by ISSN. This will identify the eLife journal.</dd>
 
-	<dt><a href="twitter/mitpress">twitter/mitpress</a></dt>
-	<dd>Redirect also works for organizations, here MIT Press</dd>
+	<dt><a href="ror/032q98j12">ror/032q98j12</a></dt>
+	<dd>Redirect also works for organizations with the Research Organisation Registry (ROR) identifier, here the Wikimedia Foundation.</dd>
 
 	<dt><a href="orcid/0000-0002-5494-8126">orcid/0000-0002-5494-8126</a></dt>
 	<dd>Lookup 0000-0002-5494-8126 that is identifying Carol Greider.</dd>