**chore(docs):** add .gitignore for docs and introduce bun.lock file

- Add `.gitignore` to exclude `node_modules/`, `.vitepress/cache/`, and `.vitepress/dist/` directories
- Include `bun.lock` for dependency management with Bun

docs/.vitepress/config.ts

@@ -0,0 +1,28 @@
+import { defineConfig } from "vitepress";
+
+export default defineConfig({
+  title: "DIUN Webhook Dashboard",
+  description: "A dashboard for DIUN Docker image update notifications",
+
+  themeConfig: {
+    nav: [
+      { text: "Guide", link: "/guide/" },
+      { text: "Gitea", link: "https://gitea.jeanlucmakiola.de/makiolaj/DiunDashboard" },
+    ],
+
+    sidebar: [
+      {
+        text: "Guide",
+        items: [
+          { text: "Getting Started", link: "/guide/" },
+        ],
+      },
+      {
+        text: "Development",
+        items: [
+          { text: "Contributing", link: "/contributing" },
+        ],
+      },
+    ],
+  },
+});