[Docs] Make images full-width

docs/admin/04_socialaccounts.rst

@@ -34,5 +34,5 @@ provider and enter client id and secret from your application and choose
 your site:
 
 .. image:: ../_static/create_social_application.png
-  :width: 400
+  :width: 100%
   :alt: Create social application

docs/user/01_personal_account.rst

@@ -23,7 +23,7 @@ Setup two-factor authentication
 
 
 .. image:: ../_static/2fa.png
-  :width: 600
+  :width: 100%
   :alt: Configure two factor authentication
 
 AlekSIS provides two factor authentication using hardware tokens such as