implemented social identities management page + pw editing page. probably need to fix backend

sideload/socialnorm/stackoverflow/src/StackOverflowProvider.php

@@ -29,6 +29,11 @@ class StackOverflowProvider extends OAuth2Provider
         'user_details' => [],
     ];
 
+    protected function providerName()
+    {
+        return 'stack';
+    }
+
 	public function __construct(array $config, HttpClient $httpClient, Request $request)
 	{
 		parent::__construct($config, $httpClient, $request);