Added CTA button display when not in edit mode

refs https://github.com/TryGhost/Team/issues/927

- button should be visible when not editing if both text and url are set
- added container for the content section so other links aren't clickable
- added tooltip to button so button url can be checked without having to go into edit mode

ghost/admin/app/templates/application.hbs

@@ -48,11 +48,13 @@
                 border-left: 0.25rem solid var(--adjusted-accent-color);
             }
 
-            .email-cta-button-text-input {
+            .email-cta-button-text-input,
+            .gh-btn-accent {
                 color: var(--text-color-for-adjusted-accent-background);
                 background-color: var(--adjusted-accent-color)
             }
-            .email-cta-button-text-input:hover {
+            .email-cta-button-text-input:hover,
+            .gh-btn-accent:hover {
                 color: {{hex-adjust this.ui.textColorForAdjustedAccentBackground l=-15}};
                 background-color: {{hex-adjust this.settings.accentColor l=-15}}
             }

ghost/admin/lib/koenig-editor/addon/components/koenig-card-email-cta.hbs

@@ -79,7 +79,12 @@
             </p>
         </div>
     {{else}}
-        <p>{{{this.formattedHtml}}}</p>
-        <div class="koenig-card-click-overlay"></div>
+        <div class="relative">
+            <p>{{{this.formattedHtml}}}</p>
+            <div class="koenig-card-click-overlay"></div>
+        </div>
+        {{#if (and @payload.buttonText @payload.buttonUrl)}}
+            <div class="mt4"><a class="gh-btn gh-btn-accent" href="javascript:void(0)" data-tooltip={{@payload.buttonUrl}}><span>{{@payload.buttonText}}</span></a></div>
+        {{/if}}
     {{/if}}
 </KoenigCard>