Optimize index size if excerpts_per_result is 0

[jameslittle230]

Closes #282

• [x] Changelog entry
• [x] Screenshot of it working on the test page

[github-actions[bot]]

Benchmarks

Benchmark	Baseline	Contender	Comparison
build/federalist	217.9713	217.133	1.0×
federalist.st	1125.456	1125.456	1.0×
search/federalist/liberty	1.9454	2.0366	1.05×
stork.js	21.961	22.082	1.01×
stork.wasm	351.162	351.342	1.0×

Baseline: a93f33f3caab84d559197c2727e08409ab427023; Comparison: 53b241d07423e3f152ec8cd53075c693963c01ab

[codecov[bot]]

Codecov Report

Merging #284 (53b241d) into master (eeaca67) will increase coverage by 0.53%. The diff coverage is 76.59%.

@@            Coverage Diff             @@
##           master     #284      +/-   ##
==========================================
+ Coverage   72.44%   72.98%   +0.53%     
==========================================
  Files          53       52       -1     
  Lines        2174     2221      +47     
  Branches      104      107       +3     
==========================================
+ Hits         1575     1621      +46     
- Misses        598      599       +1     
  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)
...index_v3/search/entry_and_intermediate_excerpts.rs	76.59% <ø> (-0.96%)	:arrow_down:
stork-lib/src/index_v3/search/mod.rs	78.65% <27.27%> (-17.13%)	:arrow_down:
stork-lib/src/index_v3/build/errors.rs	80.95% <50.00%> (+0.46%)	:arrow_up:
...rc/index_v3/build/fill_intermediate_entries/mod.rs	90.99% <75.00%> (+0.99%)	:arrow_up:
stork-lib/src/index_v3/build/mod.rs	97.72% <91.30%> (-0.85%)	:arrow_down:
js/config.ts	82.35% <100.00%> (+1.10%)	:arrow_up:
js/entity.ts	65.45% <100.00%> (ø)
... and 9 more

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