fix(doc): Docs were no longer being built and deployed in CI

[mjameswh]

What was changed

• Don't use lerna to run the maybe-install-deps-and-build-docs task as packages/docs is no longer considered a workspace package.
• There was apparently a LF character at the end of the IS_MAIN_OR_RELEASE env variable, preventing the env.IS_MAIN_OR_RELEASE == 'true' condition to evaluates to true, which in turn prevented deployment of docs to vercel.