chore(deps): upgrade Docusaurus to 3.10.0 and fix npm vulnerabilities

- Upgrade @docusaurus/core, @docusaurus/preset-classic, @docusaurus/plugin-sitemap to ^3.10.0
- Upgrade @docusaurus/module-type-aliases and @docusaurus/types to ^3.10.0
- Add overrides for serialize-javascript >=7.0.5 to resolve 18 high-severity
  RCE/DoS vulnerabilities (GHSA-5c6j-r48x-rmvq, GHSA-qj8w-gfj5-8c6v)
- Fix brace-expansion moderate vulnerability via npm audit fix

Co-Authored-By: Oz <oz-agent@warp.dev>

Author: stephanj