fix: only include relevant files in published package

[gustavkj]

I realized that all files are included in the published package, when only the the generated files in the build and dist directories are needed (apart from the package.json etc).

So with this change, only the needed files are included in the published package (the content after extracting the tarball generated by npm pack):

[coveralls]

Pull Request Test Coverage Report for Build 7504332720

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 7504141116:	0.0%
Covered Lines:	266
Relevant Lines:	266

---

💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (64b1e41) 100.00% compared to head (30ca14a) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #399   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          287       287           
  Branches        67        67           
=========================================
  Hits           287       287           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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[gagoar]

this is odd. I feel we had this already. all my other projects do 🤔