Motivation

Dependencies to chalk and lodash were added in f4434b2#diff-cccb3a8017ec51e8bfa9eb7c8c6934b3 and 9fab79c, respectively, but wasn't added to package.json.

This causes errors in Yarn 2:

[MODULE_NOT_FOUND] Error: @docusaurus/plugin-content-docs tried to access chalk, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.
[MODULE_NOT_FOUND] Error: @docusaurus/plugin-content-docs tried to access lodash, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

In the "Start test-website project" step of Yarn 2 E2E test, verify following errors are not printed:

[MODULE_NOT_FOUND] Error: @docusaurus/plugin-content-docs tried to access chalk, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.
[MODULE_NOT_FOUND] Error: @docusaurus/plugin-content-docs tried to access lodash, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.

Related PRs

Related issue: #3003