Remove service worker from jbrowse-web

[cmdcolin]

Fixes #2013

[codecov]

Codecov Report

Merging #2070 (5792032) into main (eb0d220) will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2070      +/-   ##
==========================================
+ Coverage   61.24%   61.42%   +0.17%     
==========================================
  Files         480      479       -1     
  Lines       22961    22909      -52     
  Branches     5267     5252      -15     
==========================================
+ Hits        14063    14071       +8     
+ Misses       8623     8563      -60     
  Partials      275      275              

Impacted Files	Coverage Δ
products/jbrowse-web/src/index.tsx	0.00% <ø> (ø)
packages/core/assemblyManager/assemblyManager.ts	60.86% <0.00%> (+1.44%)	⬆️
packages/core/util/io/rangeFetcher.ts	92.68% <0.00%> (+2.43%)	⬆️
...nts/src/SNPCoverageRenderer/SNPCoverageRenderer.ts	87.65% <0.00%> (+7.40%)	⬆️

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