Merge pull request #23085 from overleaf/mf-teardown-bs5-register-login

[web] Teardown bs5 login and register page

GitOrigin-RevId: e2335ecbe89212984acd24fbbaa6f9549dc45b96

services/web/frontend/stylesheets/app/login-register.less

@@ -3,12 +3,6 @@
 @brand-twitter-color: #1da1f2;
 @brand-orcid-color: #a6ce39;
 
-.login-register-alternatives {
-  .form-group:last-child {
-    margin-bottom: 0;
-  }
-}
-
 .login-register-container {
   max-width: 400px;
   margin: 0 auto;
@@ -86,22 +80,6 @@
   }
 }
 
-.login-btn-icon-twitter {
-  background-image: url(../../../public/img/other-brands/logo_twitter.svg);
-}
-
-.registration-message-heading {
-  color: @text-color;
-}
-
-.registration-message-details {
-  font-size: 90%;
-}
-
-.registration-block-separator {
-  margin-bottom: 0px;
-}
-
 .website-redesign {
   .login-register-container {
     max-width: 320px;