PLT-4524 Update password reset page (#4522)

* Implement PLT-4524 Update password reset page

* fix lints

* changes based on review

* update per request/review

* update tests

* add css for alert-success

* change per request

webapp/sass/routes/_signup.scss

@@ -13,7 +13,7 @@
 
 .signup-team__container {
     margin: 0 auto;
-    max-width: 380px;
+    max-width: 400px;
     padding: 100px 0 50px;
     position: relative;