feat: disable default sources

[cap-Bernardito]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

Fixes #333

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #351 (18f6a78) into master (3ddf5dc) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #351      +/-   ##
==========================================
+ Coverage   96.92%   96.97%   +0.04%     
==========================================
  Files           7        7              
  Lines         488      496       +8     
  Branches      130      138       +8     
==========================================
+ Hits          473      481       +8     
  Misses         15       15              

Impacted Files	Coverage Δ
src/plugins/sources-plugin.js	96.90% <100.00%> (-0.16%)	⬇️
src/utils.js	96.96% <100.00%> (+0.12%)	⬆️

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