Improve HTML content extraction behavior

[jameslittle230]

New functionality:

• Correctly excludes multiple instances of the given exclusion selector (fixes How to configure Stork to ignore <pre> tags? #279)
• The exclusion selector correctly overrides the inclusion selector

Also adds ignored tests that define the ideal behavior when you have an inclusion selector inside an inclusion selector. Currently this is not handled well - the content is duplicated.

• Changelog

[codecov]

Codecov Report

Merging #281 (c937234) into master (eeaca67) will increase coverage by 0.80%.
The diff coverage is 88.23%.

@@            Coverage Diff             @@
##           master     #281      +/-   ##
==========================================
+ Coverage   72.44%   73.25%   +0.80%     
==========================================
  Files          53       52       -1     
  Lines        2174     2191      +17     
  Branches      104      104              
==========================================
+ Hits         1575     1605      +30     
+ Misses        598      585      -13     
  Partials        1        1              

Impacted Files	Coverage Δ
stork-cli/src/clap.rs	100.00% <ø> (ø)
stork-cli/src/main.rs	0.00% <0.00%> (ø)
stork-lib/src/index_v3/build/fill_stems.rs	100.00% <ø> (ø)
stork-lib/src/index_v3/mod.rs	70.37% <ø> (ø)
stork-lib/src/index_v3/build/errors.rs	80.95% <50.00%> (+0.46%)	⬆️
...rc/index_v3/build/fill_intermediate_entries/mod.rs	90.99% <75.00%> (+0.99%)	⬆️
stork-lib/src/index_v3/build/mod.rs	96.42% <89.47%> (-2.15%)	⬇️
js/config.ts	82.35% <100.00%> (+1.10%)	⬆️
js/entity.ts	65.45% <100.00%> (ø)
stork-lib/src/index_v3/build/fill_containers.rs	91.80% <100.00%> (ø)
... and 4 more

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[github-actions]

Benchmarks

Benchmark	Baseline	Contender	Comparison
build/federalist	213.0768	215.1405	1.01×
federalist.st	1125.456	1125.456	1.0×
search/federalist/liberty	2.013	2.0636	1.03×
stork.js	21.961	21.961	1.0×
stork.wasm	356.537	356.537	1.0×

Baseline: de70fb0; Comparison: c937234