🎨 fix about logo colours in nightshift (#793)

closes https://github.com/TryGhost/Ghost/issues/8715
- use SVG logo, invert in nightshift
- fix colour of `>` in screen titles in nightshift

ghost/admin/app/styles/app-dark.css

@@ -257,3 +257,11 @@ input,
 .gh-editor .CodeMirror-cursor {
     border-color: #fff;
 }
+
+.gh-logo {
+    filter: invert(100%);
+}
+
+.gh-canvas-title span path {
+    fill: #e5eff5;
+}

ghost/admin/app/templates/about.hbs

@@ -1,6 +1,6 @@
 <section class="gh-canvas js-settings-content">
     <header class="gh-canvas-header">
-        <img class="gh-logo" src="assets/img/ghost-logo.png" alt="Ghost" />
+        {{inline-svg "ghost-logo" class="gh-logo" alt="Ghost"}}
     </header>
     <section class="view-container">
         {{gh-upgrade-notification}}

ghost/admin/public/assets/icons/ghost-logo.svg

@@ -0,0 +1 @@
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