update JSON string encodings in author directory

The following characters are no longer encoded
and are represented as themselves:

- & is no longer encoded
- / is no longer encoded
- < is no longer encoded
- > is no longer encoded
- [\x80-\xff] is no longer encoded

The author ID JSON files under `/author` have
been updated accordingly.

author/Edward_Giles.json

@@ -7,7 +7,7 @@
     "location_code" : "AU",
     "location_name" : "Australia",
     "email" : "edward@giles.net.au",
-    "url" : "https:\/\/id523a.com\/",
+    "url" : "https://id523a.com/",
     "alt_url" : null,
     "deprecated_twitter_handle" : null,
     "mastodon" : null,