Add github link and fix dark theme

Summary: {F1983762567} {F1983762568}

Reviewed By: saadhzahid

Differential Revision: D87784658

fbshipit-source-id: 920a78c27134a6df86233245b46f8e077c5a1567

Author: constantine-fry

Sources/QuickLayout/docs/docusaurus.config.js

@@ -70,14 +70,20 @@ import {themes} from 'prism-react-renderer';
       navbar: {
         title: 'QuickLayout Handbook',
         items: [
+          {
+            to: 'https://github.com/facebookincubator/QuickLayout',
+            label: 'GitHub',
+            position: 'right',
+            className: 'navbar__icon header-github-link',
+          },
         ],
       },
       footer: {
       },
       prism: {
         additionalLanguages: ['swift'],
         theme: themes.github,
-        darkTheme: themes.darcula,
+        darkTheme: themes.dracula,
       },
     }),
 });

Sources/QuickLayout/docs/src/css/custom.css

@@ -341,3 +341,29 @@ pre code {
 html[data-theme='dark'] .docusaurus-highlight-code-line {
   background-color: rgba(0, 0, 0, 0.3);
 }
+
+.header-github-link {
+  display: flex !important;
+  align-items: center;
+  gap: 6px;
+}
+
+.header-github-link:hover {
+  opacity: 0.6;
+}
+
+.header-github-link:before {
+  content: '';
+  width: 18px;
+  height: 18px;
+  display: block;
+  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12'/%3E%3C/svg%3E")
+    no-repeat;
+  background-size: contain;
+  flex-shrink: 0;
+}
+
+html[data-theme='dark'] .header-github-link:before {
+  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='white' d='M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12'/%3E%3C/svg%3E")
+    no-repeat;
+}