Update author/Matt_Zucker.json

Some information from his website collected.

author/Matt_Zucker.json

@@ -7,11 +7,11 @@
     "location_code" : "US",
     "email" : "mzucker1@swarthmore.edu",
     "url" : "https://mzucker.github.io/swarthmore/",
-    "alt_url" : null,
+    "alt_url" : "https://mzucker.github.io",
     "deprecated_twitter_handle" : null,
     "mastodon" : null,
     "mastodon_url" : null,
-    "github" : null,
+    "github" : "@mzucker",
     "affiliation" : null,
     "winning_entry_set" : [
         {

authors.html

@@ -3990,6 +3990,10 @@ Location: <a class="normal" href="location.html#US">US</a> - <em>United States</
 <br>
 URL: <a class="normal" href="https://mzucker.github.io/swarthmore/">https://mzucker.github.io/swarthmore/</a>
 <br>
+Alternate URL: <a class="normal" href="https://mzucker.github.io">https://mzucker.github.io</a>
+<br>
+GitHub: <a class="normal" href="https://github.com/mzucker"><span class="citation" data-cites="mzucker">@mzucker</span></a>
+<br>
 author_handle: <a class="normal" href="https://github.com/ioccc-src/winner/blob/master/author/Matt_Zucker.json">Matt_Zucker</a>
 <p>
 </p>