chore: rename variables

[JB1905]

Closes #76
Closes #71

[codecov]

Codecov Report

Merging #77 (1facaa7) into main (7be2ea4) will increase coverage by 11.53%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             main       #77       +/-   ##
============================================
+ Coverage   88.46%   100.00%   +11.53%     
============================================
  Files           4         3        -1     
  Lines          26        27        +1     
  Branches        3         4        +1     
============================================
+ Hits           23        27        +4     
+ Misses          3         0        -3     

Impacted Files	Coverage Δ
src/useViewport.ts	100.00% <100.00%> (ø)
src/withViewport.tsx	100.00% <100.00%> (+50.00%)	⬆️

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