optimise <title>

[Rich-Harris]

fixes #1027

[codecov-io]

Codecov Report

Merging #1053 into master will decrease coverage by 0.35%.
The diff coverage is 68.75%.

@@            Coverage Diff             @@
##           master    #1053      +/-   ##
==========================================
- Coverage   92.03%   91.67%   -0.36%     
==========================================
  Files         121      123       +2     
  Lines        4393     4456      +63     
  Branches     1416     1437      +21     
==========================================
+ Hits         4043     4085      +42     
- Misses        148      157       +9     
- Partials      202      214      +12

Impacted Files	Coverage Δ
src/generators/nodes/index.ts	100% <ø> (ø)	⬆️
...generators/server-side-rendering/visitors/index.ts	100% <ø> (ø)	⬆️
src/validate/html/validateHead.ts	60% <100%> (+60%)	⬆️
src/validate/html/validateElement.ts	90% <100%> (+0.63%)	⬆️
...generators/server-side-rendering/visitors/Title.ts	100% <100%> (ø)
src/generators/Generator.ts	93.84% <57.14%> (-0.68%)	⬇️
src/generators/nodes/Title.ts	60.46% <60.46%> (ø)
src/generators/dom/Block.ts	96.42% <0%> (-0.9%)	⬇️

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[Conduitry]

Does this update the handling of all instances of <title>, not just those that appear in <:Head>? I haven't tried, but it looks like it would. I'm not sure whether that's desirable, or whether there are any valid reasons to want a <title> element elsewhere inserted the old fashioned way - apart from what I'm assuming is the special case for SVG stuff.

[Rich-Harris]

Good catch, thank you. Fixed