Add new user entry for RussellChubb.com (#3035)

Added my personal website as an entry into the "Users" page.

Thank you for creating the Blowfish Theme, I've loved spending time developing my website with your theme!

Cheers! :)

exampleSite/content/users/users.json

@@ -7,6 +7,14 @@
       "Personal site",
       "Theme author"
     ]
+  },
+    {
+    "title": "RussellChubb.com",
+    "url": "https://russellchubb.com",
+    "source": "n/a",
+    "tags": [
+      "Personal site"
+    ]
   },
   {
     "title": "madoke.org",