refactor(cards): added typings for cards and fetchers

[anuraghazra]

• TODO: Refactor types
• TODO: Organize types

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[codecov]

Codecov Report

Merging #1596 (c73cbf6) into master (36aeb5c) will decrease coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1596      +/-   ##
==========================================
- Coverage   94.81%   94.59%   -0.22%     
==========================================
  Files          22       22              
  Lines         752      759       +7     
  Branches      205      205              
==========================================
+ Hits          713      718       +5     
- Misses         35       37       +2     
  Partials        4        4              

Impacted Files	Coverage Δ
api/pin.js	88.88% <ø> (ø)
src/cards/repo-card.js	100.00% <ø> (ø)
src/common/utils.js	98.16% <ø> (ø)
src/fetchers/repo-fetcher.js	95.83% <ø> (ø)
src/fetchers/top-languages-fetcher.js	100.00% <ø> (ø)
src/fetchers/wakatime-fetcher.js	90.90% <ø> (ø)
src/getStyles.js	56.25% <ø> (ø)
src/cards/stats-card.js	100.00% <100.00%> (ø)
src/cards/top-languages-card.js	100.00% <100.00%> (ø)
src/cards/wakatime-card.js	98.76% <100.00%> (ø)
... and 2 more

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[rickstaa]

Great! Looks like a handy addition. I will review this later this month. Feel free to ping me if I forget.