Switch to base_url config var for base URL in docs and collection

[shalvah]

No description provided.

[codecov-io]

Codecov Report

Merging #523 into master will increase coverage by 1.03%.
The diff coverage is 88.23%.

@@             Coverage Diff              @@
##             master     #523      +/-   ##
============================================
+ Coverage     92.54%   93.58%   +1.03%     
- Complexity      279      372      +93     
============================================
  Files            13       14       +1     
  Lines           644      779     +135     
============================================
+ Hits            596      729     +133     
- Misses           48       50       +2

Impacted Files	Coverage Δ	Complexity Δ
src/Tools/Generator.php	97.58% <100%> (+1.88%)	142 <2> (+57)	⬆️
.../Tools/ResponseStrategies/ResponseCallStrategy.php	94.06% <100%> (+0.05%)	40 <0> (ø)	⬇️
src/Tools/DocumentationConfig.php	100% <100%> (ø)	2 <2> (?)
src/Postman/CollectionWriter.php	81.25% <50%> (-8.04%)	18 <1> (+1)
src/Commands/GenerateDocumentation.php	94.73% <94.11%> (+1.6%)	74 <0> (+30)	⬆️
src/Tools/Utils.php	100% <0%> (ø)	13% <0%> (+3%)	⬆️

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[shalvah]

Closes #520