refactor: Move constants to the constants.ts file

[ardalanamini]

📑 Description

• Move constants to the constants.ts file

✅ Checks

• My code requires changes to the documentation
• I have updated the documentation as required

[codecov]

Codecov Report

Merging #8 (bb3cc4f) into main (cfeea37) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #8   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         5    +1     
  Lines           69        70    +1     
  Branches         8         8           
=========================================
+ Hits            69        70    +1     

Impacted Files	Coverage Δ
src/MiniCSS.ts	100.00% <ø> (ø)
src/index.ts	100.00% <ø> (ø)
src/constants.ts	100.00% <100.00%> (ø)
src/utils.ts	100.00% <100.00%> (ø)

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