use eslint with stylistic for tidying javascript

[haarg]

eslint and stylistic is more configurable than prettier and can have better alignment. We are also already using eslint.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.61%. Comparing base (e59beb0) to head (1bcb6d8).

Additional details and impacted files

@@ Coverage Diff @@ ## master #3460 +/- ## ========================================== - Coverage 73.63% 73.61% -0.02%  ========================================== Files 67 67 Lines 2355 2354 -1 Branches 333 333 ========================================== - Hits 1734 1733 -1  Misses 497 497 Partials 124 124 

Files with missing lines	Coverage Δ
lib/MetaCPAN/Web/Controller/Feed.pm	89.56% <100.00%> (-0.09%)	⬇️

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