Reduce unified login cookie size

By dropping some of the less likely-to-be-used items.

srht/flask.py

@@ -445,6 +445,7 @@ class SrhtFlask(Flask):
             else:
                 # Set user info cookie
                 user_info = g.current_user.to_dict(first_party=True)
+                user_info = {k:v for k,v in user_info.items() if k not in ['bio', 'location', 'url']}
                 user_info = json.dumps(user_info)
                 response.set_cookie(cookie_key,
                         fernet.encrypt(user_info.encode()).decode(),