Fix author/Anton_Algmyr.json, rebuild authors.html

The json file had the email as a url by accident. The authors.html file
is not checked yet but will be soon, very possibly tomorrow, along with
the last (for the moment) top level html file (I think).

author/Anton_Algmyr.json

@@ -5,8 +5,8 @@
     "full_name" : "Anton Älgmyr",
     "sort_word" : "algmyr",
     "location_code" : "SE",
-    "email" : "@aalgmyr",
-    "url" : "algmyr@student.chalmers.se",
+    "email" : "algmyr@student.chalmers.se",
+    "url" : null,
     "alt_url" : null,
     "deprecated_twitter_handle" : "@aalgmyr",
     "mastodon" : null,

authors.html

@@ -442,8 +442,6 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#SE">SE</a> - <em>Kingdom of Sweden</em> (<em>Sweden</em>)
 <br>
-URL: <a href="algmyr@student.chalmers.se">algmyr@student.chalmers.se</a>
-<br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Anton_Algmyr.json">Anton_Algmyr</a>
 <p>
 </p>