chore: update orca docs structure/nav/sidebar

Author: amessbee

main/.vitepress/config.mjs

@@ -127,26 +127,30 @@ export default defineConfig({
           items: [
             {
               text: 'Key Concepts and APIs',
-              link: '/guides/orchestration/getting-started/key-concepts',
+              link: '/guides/orchestration/key-concepts',
             },
             {
               text: 'Contract Walkthroughs',
-              link: '/guides/orchestration/getting-started/contract-walkthroughs',
+              link: '/guides/orchestration/contract-walkthroughs',
               items: [
                 {
                   text: 'Send Anywhere Example',
-                  link: '/guides/orchestration/getting-started/contract-walkthrough/send-anywhere',
+                  link: '/guides/orchestration/contract-walkthrough/send-anywhere',
                 },
                 {
                   text: 'Cross-Chain Swap Example',
-                  link: '/guides/orchestration/getting-started/contract-walkthrough/cross-chain-swap',
+                  link: '/guides/orchestration/contract-walkthrough/cross-chain-swap',
                 },
                 {
                   text: 'Cross-Chain Unbond Example',
-                  link: '/guides/orchestration/getting-started/contract-walkthrough/cross-chain-unbond',
+                  link: '/guides/orchestration/contract-walkthrough/cross-chain-unbond',
                 }
               ]
             },
+            {
+              text: 'Example Orchestration DApp',
+              link: '/guides/orchestration/orchestration-basics',
+            },
             {
               text: 'How Orchestration Works',
               link: '/guides/orchestration/how-orch-works',

main/.vitepress/themeConfig/nav.js

@@ -15,25 +15,29 @@ export const nav = [
       },
       {
         text: 'Key Concepts and APIs',
-        link: '/guides/orchestration/getting-started/key-concepts',
+        link: '/guides/orchestration/key-concepts',
       },
       {
         text: 'Contract Walkthroughs',
         items: [
           {
             text: 'Send Anywhere Example',
-            link: '/guides/orchestration/getting-started/contract-walkthrough/send-anywhere',
+            link: '/guides/orchestration/contract-walkthrough/send-anywhere',
           },
           {
             text: 'Cross-Chain Swap Example',
-            link: '/guides/orchestration/getting-started/contract-walkthrough/cross-chain-swap',
+            link: '/guides/orchestration/contract-walkthrough/cross-chain-swap',
           },
           {
             text: 'Cross-Chain Unbond Example',
-            link: '/guides/orchestration/getting-started/contract-walkthrough/cross-chain-unbond',
+            link: '/guides/orchestration/contract-walkthrough/cross-chain-unbond',
           }
         ]
       },
+      {
+        text: 'Example Orchestration DApp',
+        link: '/guides/orchestration/orchestration-basics',
+      },
       {
         text: 'How Orchestration Works',
         link: "/guides/orchestration/how-orch-works",