Document the need for Developer Mode on Windows

[srmagura]

Closes #455.

Also added a 404 page to get rid of the "please add a 404 page" warning.

[changeset-bot]

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Latest commit: 12867c5

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[codecov]

Codecov Report

Merging #458 (801251a) into main (76f0163) will not change coverage.
The diff coverage is n/a.

❗ Current head 801251a differs from pull request most recent head 12867c5. Consider uploading reports for the commit 12867c5 to get more accurate results

@@           Coverage Diff           @@
##             main     #458   +/-   ##
=======================================
  Coverage   92.25%   92.25%           
=======================================
  Files          32       32           
  Lines        1459     1459           
  Branches      409      409           
=======================================
  Hits         1346     1346           
  Misses        108      108           
  Partials        5        5           

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[emmatown]

Thanks!