Remove CSS Modules and manage styles with a custom css-in-js solution.

[sergiop]

Closes #45

[codecov]

Codecov Report

Merging #47 (6470752) into master (beca4f0) will decrease coverage by 3.12%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
- Coverage   98.19%   95.07%   -3.13%     
==========================================
  Files          13       21       +8     
  Lines         111      142      +31     
==========================================
+ Hits          109      135      +26     
- Misses          2        7       +5     

Impacted Files	Coverage Δ
src/style/useStyle.js	68.75% <68.75%> (ø)
src/components/Alert/Alert.js	100.00% <100.00%> (ø)
src/components/Alert/alertStyles.js	100.00% <100.00%> (ø)
src/components/ImageItem/ImageItem.js	87.50% <100.00%> (+1.78%)	⬆️
src/components/ImageItem/imageItemStyles.js	100.00% <100.00%> (ø)
src/components/PoweredByGiphy/PoweredByGiphy.js	100.00% <100.00%> (ø)
.../components/PoweredByGiphy/poweredByGiphyStyles.js	100.00% <100.00%> (ø)
src/components/SearchForm/SearchForm.js	100.00% <100.00%> (ø)
src/components/SearchForm/searchFormStyles.js	100.00% <100.00%> (ø)
src/components/Spinner/Spinner.js	100.00% <100.00%> (ø)
... and 12 more

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