fix: Adding gatsby remove serviceworker

[craig-rueda]

SUMMARY

Looks like the docs site is caching locally, which prevents changes from going out effectively.

This PR removes the local caching mechanism.

[codecov-io]

Codecov Report

Merging #12692 (9ac263d) into master (57fa6d2) will decrease coverage by 0.27%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12692      +/-   ##
==========================================
- Coverage   66.93%   66.65%   -0.28%     
==========================================
  Files        1018     1018              
  Lines       49790    49790              
  Branches     4875     4875              
==========================================
- Hits        33326    33190     -136     
- Misses      16341    16477     +136     
  Partials      123      123              

Flag	Coverage Δ
cypress	50.95% <ø> (+<0.01%)	⬆️
javascript	60.95% <ø> (ø)
python	63.67% <ø> (-0.46%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/db_engines/hive.py	0.00% <0.00%> (-85.72%)	⬇️
superset/db_engine_specs/hive.py	54.61% <0.00%> (-29.24%)	⬇️
superset/db_engine_specs/presto.py	81.38% <0.00%> (-7.15%)	⬇️
superset/views/database/mixins.py	80.70% <0.00%> (-1.76%)	⬇️
superset/models/core.py	88.04% <0.00%> (-0.82%)	⬇️
...set-frontend/src/dashboard/util/getDropPosition.js	93.65% <0.00%> (+1.58%)	⬆️

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[ktmud]

Why was the symptom of the problems you were seeing? Would properly enable gatsby-plugin-offline also fix it?

According to Gatsby doc, it seems gatsby-plugin-remove-serviceworker is used to remove outdated service workers.