chore(deps): bump lodash and @astrojs/language-server in /docs-site

Removes [lodash](https://github.com/lodash/lodash). It's no longer used after updating ancestor dependency [@astrojs/language-server](https://github.com/withastro/astro/tree/HEAD/packages/language-tools/language-server). These dependencies need to be updated together.


Removes `lodash`

Updates `@astrojs/language-server` from 2.16.4 to 2.16.6
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/language-tools/language-server/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/language-server@2.16.6/packages/language-tools/language-server)

---
updated-dependencies:
- dependency-name: lodash
  dependency-version: 
  dependency-type: indirect
- dependency-name: "@astrojs/language-server"
  dependency-version: 2.16.6
  dependency-type: indirect
...

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Author: dependabot[bot]