improve data on author_handle.json files

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

author/Thomas_P_John.json

@@ -4,8 +4,8 @@
     "author_handle" : "Thomas_P_John",
     "full_name" : "Thomas P John",
     "sort_word" : "john",
-    "location_code" : null,
-    "location_name" : null,
+    "location_code" : "NL",
+    "location_name" : "Netherlands",
     "email" : "thomaspjohn@hotmail.com",
     "url" : "https://web.archive.org/web/20010720192926/http://tomx.tripod.com/",
     "alt_url" : null,