chore: pin vitepress to 2.0.0 and add sponsor link

package.json

@@ -81,7 +81,7 @@
 		"typescript": "^5.8.3",
 		"vite": "^6.3.5",
 		"vite-tsconfig-paths": "^5.1.4",
-		"vitepress": "^1.6.4",
+		"vitepress": "next",
 		"vitest": "^3.1.3"
 	},
 	"packageManager": "pnpm@10.4.0",
@@ -94,14 +94,8 @@
 			"react-router-hono-server": "patches/react-router-hono-server.patch"
 		},
 		"supportedArchitectures": {
-			"os": [
-				"current",
-				"linux"
-			],
-			"cpu": [
-				"x64",
-				"arm64"
-			]
+			"os": ["current", "linux"],
+			"cpu": ["x64", "arm64"]
 		},
 		"onlyBuiltDependencies": [
 			"@biomejs/biome",