Keep only relevant npm WordPress packages

[kadimi]

Changes proposed in this Pull Request:

The @wordpress/scripts npm package offers 13 scripts but only 2 are used by _s. I thought that adding only those two scripts to the project instead of the whole family would improve it and it certainly did. Here is a comparison:

npm install Before the Change

added 1884 packages from 774 contributors and audited 1887 packages in 53.306s
# ...
found 2 vulnerabilities

npm install After the Change

added 604 packages from 373 contributors and audited 604 packages in 15.74s
# ...
found 0 vulnerabilities

Comparison

	Before	After	% Improvement
Packages	1884	604	312%
Vulnerabilities	2	0	∞%
Time	53.306s	15.74s	339%