Avoid creating documentation during the build script

Summary

There is no need to create documentation inside of the build script, as it takes too long and is not needed after #11 (closed) is solved.

Steps to reproduce

Run npm run build e.g. on @openstapps/api project.

What is the current bug behavior?

Build script needs too long to execute (as it creates documentation). Documentation can be created running npm run documentation separately, which is already done so in pages job in .gitlab-ci.yml e.g. in core or api.

What is the expected correct behavior?

Build should build only (prepare for execution and publishing the package).

Possible fixes

Removing npm run documentation from the build script. We could make @openstapps/configuration give suggestion about it, or simply remove the part from the script's string.

Cc: @All