feat: 🎸 Add doc link to Credential screens (#1214)

✅ Closes: ICU-5317

ui/admin/app/templates/scopes/scope/credential-stores/credential-store/credentials/credential/index.hbs

@@ -7,6 +7,7 @@
   <page.header>
     <h2>
       {{t 'resources.credential.title'}}
+      <DocLink @doc='credential' @iconSize='large' />
     </h2>
     <p>{{t 'resources.credential.description'}}</p>
     <Copyable

ui/admin/app/templates/scopes/scope/credential-stores/credential-store/credentials/new.hbs

@@ -9,6 +9,7 @@
   <page.header>
     <h2>
       {{t 'titles.new'}}
+      <DocLink @doc='credential' @iconSize='large' />
     </h2>
   </page.header>
 

ui/admin/config/environment.js

@@ -79,6 +79,7 @@ module.exports = function (environment) {
         'host-set.add-hosts': '/host-sets/add-hosts',
         'credential-store': '/credential-stores',
         'credential-library': '/credential-libraries',
+        credential: '/credentials',
         host: '/hosts',
         'host.new': '/hosts/new',
         role: '/roles',