improve data on author_handle.json files

Updated URLs, Email addresses, GitHub handles,
Mastodon handles, and locations of various IOCCC winning authors.

author/Alan_De_Smet.json

@@ -4,10 +4,10 @@
     "author_handle" : "Alan_De_Smet",
     "full_name" : "Alan De Smet",
     "sort_word" : "smet",
-    "location_code" : null,
-    "location_name" : null,
+    "location_code" : "US",
+    "location_name" : "United States of America",
     "email" : null,
-    "url" : "http://www.highprogrammer.com/alan",
+    "url" : "http://www.highprogrammer.com/alan/",
     "alt_url" : null,
     "deprecated_twitter_handle" : null,
     "mastodon" : null,