🎨 bring back the view site link (#727)

no issue
- brings "view site" link back to the bottom of the nav bar

ghost/admin/app/styles/layouts/main.css

@@ -236,6 +236,25 @@ body > .ember-view:not(.default-liquid-destination) {
     stroke: var(--darkgrey);
 }
 
+.gh-nav-foot-sitelink {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    height: 46px;
+    border-top: color(var(--lightgrey) l(-1%)) 1px solid;
+    text-align: center;
+    font-size: 1.2rem;
+    line-height: 1em;
+    font-weight: 300;
+    color:  color(var(--midgrey) l(+5%));
+}
+
+.gh-nav-foot-sitelink svg {
+    width: 13px;
+    margin-left: 5px;
+    fill: color(var(--midgrey) l(+5%));
+}
+
 /* Mobile Nav Menu (Slides out)
 /* ---------------------------------------------------------- */
 

ghost/admin/app/templates/components/gh-nav-menu.hbs

@@ -10,7 +10,6 @@
     {{/dropdown.trigger}}
     {{#dropdown.content class="gh-nav-menu-dropdown"}}
         <ul class="dropdown-menu dropdown-triangle-top" role="menu" {{action dropdown.actions.close on="click" preventDefault=false}}>
-            <li role="presentation"><a href="{{config.blogUrl}}/" target="_blank">View site</a></li>
             <li role="presentation">{{#link-to "about" classNames="gh-nav-menu-about dropdown-item js-nav-item" role="menuitem" tabindex="-1"}}{{inline-svg "store"}} About Ghost{{/link-to}}</li>
             <li class="divider"></li>
             <li role="presentation">{{#link-to "team.user" session.user.slug classNames="dropdown-item user-menu-profile js-nav-item" role="menuitem" tabindex="-1"}}{{inline-svg "user-circle"}} Your Profile{{/link-to}}</li>
@@ -57,4 +56,7 @@
         </ul>
     {{/if}}
 </section>
+<footer class="gh-nav-foot">
+    <a class="gh-nav-foot-sitelink" href="{{config.blogUrl}}/" target="_blank">View site {{inline-svg "external"}}</a>
+</footer>
 <div class="gh-autonav-toggle" {{action "openAutoNav" on="mouseEnter"}}></div>