docs: clean up side bar and navigation, add getting started (#418)

website/data/docs-navigation.js

@@ -8,12 +8,19 @@
 
 export default [
   {
-    category: 'introduction',
+    category: 'getting-started',
+    content: ['building', 'run-and-login', 'connect-to-target'],
+  },
+  {
+    category: 'installing',
+    content: ['production'],
+  },
+  {
+    category: 'concepts',
     content: [
       'security-model',
-      'reference-architecture',
       {
-        category: 'concepts',
+        category: 'domain-model',
         content: [
           'actions',
           'auth-methods',
@@ -34,10 +41,6 @@ export default [
       },
     ],
   },
-  {
-    category: 'installing',
-    content: ['dev-mode', 'production'],
-  },
   {
     category: 'configuration',
     content: [