PLT-2553 Updated backstage page navigation (#2661)

* Updated integrations list based on feedback

* Reorganized Integrations pages

* Repurposed AddIntegration page as a landing page for Integrations

* Moved backstage breadcrumb header into its own component

* Removed unnecessary prop

* Fixed Save links on AddIntegration pages

webapp/sass/routes/_backstage.scss

@@ -207,11 +207,12 @@ body {
         font-weight: 600;
     }
 
-    .item-details__type {
+    .item-details__trigger {
         margin-left: 6px;
     }
 
     .item-details__description,
+    .item-details__token,
     .item-details__creation {
         color: $dark-gray;
         display: inline-block;
@@ -283,7 +284,7 @@ body {
     }
 }
 
-.add-integration {
+.integration-option {
     background-color: $white;
     border: 1px solid $light-gray;
     display: inline-block;
@@ -300,16 +301,16 @@ body {
     }
 }
 
-.add-integration__image {
+.integration-option__image {
     height: 80px;
     width: 80px;
 }
 
-.add-integration__title {
+.integration-option__title {
     color: $black;
     margin-bottom: 10px;
 }
 
-.add-integration__description {
+.integration-option__description {
     color: $dark-gray;
 }