Stop backing up the node_modules folder

[bertdeblock]

Closes #189.
Closes #598.
Closes #813.

[codecov]

Codecov Report

Merging #962 (56f216c) into master (ec8d2ab) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

❗ Current head 56f216c differs from pull request most recent head 998054e. Consider uploading reports for the commit 998054e to get more accurate results

@@            Coverage Diff             @@
##           master     #962      +/-   ##
==========================================
- Coverage   94.59%   94.53%   -0.06%     
==========================================
  Files          17       17              
  Lines         555      549       -6     
==========================================
- Hits          525      519       -6     
  Misses         30       30              

Files Changed	Coverage Δ
lib/dependency-manager-adapters/npm.js	98.33% <100.00%> (-0.08%)	⬇️

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[kategengler]

Thank you!