improve data on author_handle.json files

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

author/Nathan_Otterness.json

@@ -12,7 +12,7 @@
     "deprecated_twitter_handle" : null,
     "mastodon" : null,
     "mastodon_url" : null,
-    "github" : null,
+    "github" : "@yalue",
     "affiliation" : null,
     "winning_entry_set" : [
 	{ "winner_id" : "2020_otterness" }