Detect modern RDoc versions

Also updated RDoc website URL

src/apps.json

@@ -8596,11 +8596,15 @@
       ],
       "html": [
         "<link[^>]+href=\"[^\"]*rdoc-style\\.css",
-        "Generated by <a[^>]+href=\"https?://rdoc\\.rubyforge\\.org[^>]+>RDoc</a> ([\\d.]*\\d)\\;version:\\1"
+        "Generated by <a[^>]+href=\"https?://rdoc\\.rubyforge\\.org[^>]+>RDoc</a> ([\\d.]*\\d)\\;version:\\1",
+	"<footer(?:(?!<\\/footer>)[^]){1,500}<p>\\s*Generated by <a href=\"https:\\/\\/ruby\\.github\\.io\\/rdoc\\/\">RDoc<\\/a> ([\\d.]*\\d)\\;version:\\1"
       ],
+      "js": {
+        "rdoc_rel_prefix": ""
+      },
       "icon": "RDoc.png",
       "implies": "Ruby",
-      "website": "https://github.com/RDoc/RDoc"
+      "website": "https://github.com/ruby/rdoc"
     },
     "RackCache": {
       "cats": [