**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/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "diun-webhook-dashboard-docs",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vitepress dev --port 5174",
+    "build": "vitepress build",
+    "preview": "vitepress preview --port 5174"
+  },
+  "devDependencies": {
+    "vitepress": "^1.6.3"
+  }
+}