Escape entities correctly when compiling to static HTML

[Rich-Harris]

fixes #1066

[codecov-io]

Codecov Report

Merging #1073 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1073      +/-   ##
==========================================
+ Coverage   91.68%   91.68%   +<.01%     
==========================================
  Files         123      123              
  Lines        4460     4462       +2     
  Branches     1439     1439              
==========================================
+ Hits         4089     4091       +2     
  Misses        157      157              
  Partials      214      214

Impacted Files	Coverage Δ
src/generators/nodes/Element.ts	95.04% <100%> (ø)	⬆️
.../generators/server-side-rendering/visitors/Text.ts	100% <100%> (ø)	⬆️
src/utils/stringify.ts	100% <100%> (ø)	⬆️

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