Improve fonts repository + builder

[johnfercher]

Description

• Improve fonts repository + builder

Related Issue

Checklist

check with "x", if applied to your change

• All methods associated with structs has func (s *struct) method() {} name style.
• Wrote unit tests for new/changed features.
• Updated docs/doc.go
• Updated pkg/pdf/example_test.go
• Updated README.md
• Updated all examples inside internal/examples
• New public methods/structs/interfaces has comments upside them explaining they responsibilities
• Executed make dod with none issues pointed out by golangci-lint and goreportcard-cli

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (04109aa) 43.29% compared to head (46301a3) 43.37%.

❗ Current head 46301a3 differs from pull request most recent head ccf1e0f. Consider uploading reports for the commit ccf1e0f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##               v2     #340      +/-   ##
==========================================
+ Coverage   43.29%   43.37%   +0.09%     
==========================================
  Files          42       42              
  Lines        1541     1538       -3     
==========================================
  Hits          667      667              
+ Misses        857      854       -3     
  Partials       17       17              

Flag	Coverage Δ
unittests	43.37% <0.00%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
pkg/config/builder.go	57.15% <0.00%> (+1.05%)	⬆️

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