Revert "Add bootstrap and basic layout"

This reverts commit 2ab583cb17.

Hcs.WebApp/wwwroot/app.css

@@ -1,25 +1,3 @@
-html, body {
-    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
-}
-
-a, .btn-link {
-    color: #006bb7;
-}
-
-.btn-primary {
-    color: #fff;
-    background-color: #1b6ec2;
-    border-color: #1861ac;
-}
-
-.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
-    box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
-}
-
-.content {
-    padding-top: 1.1rem;
-}
-
 h1:focus {
     outline: none;
 }
@@ -43,7 +21,7 @@ h1:focus {
 }
 
     .blazor-error-boundary::after {
-        content: "An error has occurred"
+        content: "An error has occurred."
     }
 
 .darker-border-checkbox.form-check-input {