chore(deps): bump @nuxtjs/mdc and @nuxt/content (#56)

Bumps [@nuxtjs/mdc](https://github.com/nuxt-modules/mdc) to 0.13.3 and updates ancestor dependency [@nuxt/content](https://github.com/nuxt/content). These dependencies need to be updated together.


Updates `@nuxtjs/mdc` from 0.5.0 to 0.13.3
- [Release notes](https://github.com/nuxt-modules/mdc/releases)
- [Changelog](https://github.com/nuxt-modules/mdc/blob/main/CHANGELOG.md)
- [Commits](nuxt-modules/mdc@v0.5.0...v0.13.3)

Updates `@nuxt/content` from 2.12.0 to 3.1.0
- [Release notes](https://github.com/nuxt/content/releases)
- [Changelog](https://github.com/nuxt/content/blob/main/CHANGELOG.md)
- [Commits](nuxt/content@v2.12.0...v3.1.0)

---
updated-dependencies:
- dependency-name: "@nuxtjs/mdc"
  dependency-type: indirect
- dependency-name: "@nuxt/content"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>