build: avoid /docs/api and /docs/doc/api upload

Fixes: https://github.com/nodejs/node/issues/12833
PR-URL: https://github.com/nodejs/node/pull/12957


Reviewed-By: João Reis <reis@janeasystems.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Michael Dawson <mhdawson@ibm.com>