refactor: remove babel transpilation

[nfischer]

This removes the babel transpiler and refactors the code to be compatible with commonjs imports.

Test: npm test
Test: echo "foo\nfoobar\nbar" | ./src/cli.js grep 'foo'
Test: echo "foo\nfoobar\nbar" | ./src/cli.js sed 's/foo/bar/'
Test: ./src/cli.js grep 'foo' ~/foobartest.txt
Test: ./src/cli.js sed 's/foo/bar/' ~/foobartest.txt

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (bd48247) to head (b3809f9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #237   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          122       126    +4     
=========================================
+ Hits           122       126    +4     

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