Refined Portal redirect URLs

- added footer text and placeholder for Portal redirect URL input fields

ghost/admin/app/components/gh-url-input.hbs

@@ -3,5 +3,6 @@
     @type="text"
     @input={{setValue}}
     @focus-out={{validateUrlInput}}
+    @placeholder={{placeholder}}
 />
 

ghost/admin/app/components/gh-url-input.js

@@ -16,6 +16,7 @@ export default class GhUrlInput extends Component {
         this.value = args.value && args.value !== '/' ? (new URL(removeLeadingSlash(args.value), this.baseUrl)).href : '';
         this.setResult = args.setResult;
         this.validateUrl = args.validateUrl;
+        this.placeholder = args.placeholder;
     }
 
     @action

ghost/admin/app/components/modal-portal-settings.hbs

@@ -226,12 +226,14 @@
                                     @baseUrl={{readonly this.siteUrl}}
                                     @setResult={{action "setFreeSignupRedirect"}}
                                     @validateUrl={{action "validateFreeSignupRedirect"}}
+                                    @placeholder={{readonly this.siteUrl}}
                                 />
                             </div>
                             <GhErrorMessage
                                 @errors={{settings.errors}}
                                 @property="membersFreeSignupRedirect"
                             />
+                            <p>Redirect to this URL after free signup</p>
                         </GhFormGroup>
                         {{#if (and this.isStripeConfigured (or this.isMonthlyChecked this.isYearlyChecked))}}
                         <GhFormGroup
@@ -248,13 +250,14 @@
                                     @baseUrl={{readonly this.siteUrl}}
                                     @setResult={{action "setPaidSignupRedirect"}}
                                     @validateUrl={{action "validatePaidSignupRedirect"}}
+                                    @placeholder={{readonly this.siteUrl}}
                                 />
                             </div>
                             <GhErrorMessage
                                 @errors={{settings.errors}}
                                 @property="membersPaidSignupRedirect"
                             />
-                            <p>Members will be sent to these URLs after successful signup. If empty, the homepage will be used.</p>
+                            <p>Redirect to this URL after paid signup</p>
                         </GhFormGroup>
                         {{/if}}
                     </div>

ghost/admin/app/styles/layouts/portal-settings.css

@@ -579,5 +579,5 @@
 }
 
 .gh-portal-setting-section.redirects p {
-    margin-top: 16px;
+    margin-top: 4px;
 }