Changes list of variants in variants.yml from array to dictionary

[arthurpalves]

What does this PR do

• Changes list of variants in variants.yml from array to dictionary
• Updates docs and resources accordingly

Task

resolves #114

Checklist:

• I ran make validation locally with success
• I have not introduced new bugs
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new errors

[codecov]

Codecov Report

Merging #116 (9256ccb) into develop (eba7c3f) will increase coverage by 1.12%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #116      +/-   ##
===========================================
+ Coverage    61.61%   62.73%   +1.12%     
===========================================
  Files           29       30       +1     
  Lines         1029     1060      +31     
===========================================
+ Hits           634      665      +31     
  Misses         395      395              

Impacted Files	Coverage Δ
.../VariantsCore/Schemas/Android/AndroidVariant.swift	95.65% <ø> (ø)
Sources/VariantsCore/Schemas/iOS/iOSVariant.swift	97.29% <ø> (ø)
...ntsCore/Schemas/Android/AndroidConfiguration.swift	100.00% <100.00%> (ø)
...es/VariantsCore/Schemas/iOS/iOSConfiguration.swift	100.00% <100.00%> (ø)

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