improve data on author_handle.json files

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

author/Immanuel_Herrmann.json

@@ -4,8 +4,8 @@
     "author_handle" : "Immanuel_Herrmann",
     "full_name" : "Immanuel Herrmann",
     "sort_word" : "herrmann",
-    "location_code" : null,
-    "location_name" : null,
+    "location_code" : "DE",
+    "location_name" : "Germany",
     "email" : null,
     "url" : "https://web.archive.org/web/20071018081145/http://pcpool.mathematik.uni-freiburg.de/~immi/",
     "alt_url" : null,