build: Use Vite HTML env variable replacement

[mattrunyon]

Fixes #1161

Also fixed an embed-grid/embed-chart Vite proxy server issue in preview mode

Tested by running npm start and looking at those tags in the head which should be replaced (base, npm version, favicon). Then ran npm run build and npm run preview and checked the tags in the built version

[codecov]

Codecov Report

Merging #1304 (3f220c4) into main (d304300) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1304   +/-   ##
=======================================
  Coverage   45.89%   45.89%           
=======================================
  Files         492      492           
  Lines       34371    34371           
  Branches     8566     8566           
=======================================
  Hits        15775    15775           
  Misses      18545    18545           
  Partials       51       51           

Flag	Coverage Δ
unit	45.89% <ø> (ø)

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