improve data on author_handle.json files

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

author/Ian_Collier.json

@@ -6,8 +6,8 @@
     "sort_word" : "collier",
     "location_code" : "GB",
     "location_name" : "United Kingdom of Great Britain and Northern Ireland (the)",
-    "email" : "imc@comlab.ox.ac.uk",
-    "url" : "http://www.comlab.ox.ac.uk/oucl/users/ian.collier/",
+    "email" : "Ian.Collier@cs.ox.ac.uk",
+    "url" : "https://www.cs.ox.ac.uk/people/ian.collier/",
     "alt_url" : null,
     "deprecated_twitter_handle" : null,
     "mastodon" : null,