fix(docs): resolve npm audit vulnerabilities (opensearch-project#177)

Run npm audit fix to patch:
- astro: remote allowlist bypass
- defu: prototype pollution (high)
- flatted: prototype pollution (high)
- h3: path traversal & SSE injection (high)
- happy-dom: credential leak & code injection (high)
- picomatch: ReDoS & method injection (high)
- vite: path traversal & arbitrary file read (high)
- smol-toml: DoS via commented lines (moderate)

Signed-off-by: Joshua Li <joshuali925@gmail.com>

Author: joshuali925