refactor: use internal instead of not external

[Graborg]

Based on #539

Change from !remote? -> internal? and handle all the domino effects of this.

[codecov-io]

Codecov Report

Merging #541 into master will decrease coverage by 0.19%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #541     +/-   ##
=========================================
- Coverage   98.61%   98.41%   -0.2%     
=========================================
  Files          30       30             
  Lines        1943     1956     +13     
=========================================
+ Hits         1916     1925      +9     
- Misses         27       31      +4

Impacted Files	Coverage Δ
spec/html-proofer/links_spec.rb	99.28% <100%> (+0.01%)	⬆️
lib/html-proofer/element.rb	99.21% <100%> (+1.65%)	⬆️
lib/html-proofer/check/links.rb	91.56% <100%> (-7.23%)	⬇️

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[gjtorikian]

Thanks!

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@f759f90). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #541   +/-   ##
=========================================
  Coverage          ?   98.45%           
=========================================
  Files             ?       30           
  Lines             ?     1946           
  Branches          ?        0           
=========================================
  Hits              ?     1916           
  Misses            ?       30           
  Partials          ?        0

Impacted Files	Coverage Δ
lib/html-proofer/utils.rb	100% <100%> (ø)
spec/html-proofer/links_spec.rb	99.29% <100%> (ø)
lib/html-proofer/check/links.rb	92.68% <100%> (ø)
lib/html-proofer/middleware.rb	96.55% <100%> (ø)
lib/html-proofer/element.rb	98.46% <100%> (ø)
spec/html-proofer/utils_spec.rb	100% <100%> (ø)

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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