Fix timestamp formatting to match documentation

[jameslittle230]

• minutes_and_seconds is a supported config value
• template string expects {} instead of {ts}

Closes #330

[codecov]

Codecov Report

Merging #331 (fb8a559) into master (eeaca67) will increase coverage by 1.20%.
The diff coverage is 81.30%.

❗ Current head fb8a559 differs from pull request most recent head 39a546e. Consider uploading reports for the commit 39a546e to get more accurate results

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
+ Coverage   72.44%   73.65%   +1.20%     
==========================================
  Files          53       52       -1     
  Lines        2174     2270      +96     
  Branches      104      108       +4     
==========================================
+ Hits         1575     1672      +97     
+ Misses        598      597       -1     
  Partials        1        1              

Impacted Files	Coverage Δ
stork-cli/src/io.rs	0.00% <0.00%> (ø)
stork-cli/src/main.rs	0.00% <0.00%> (ø)
stork-lib/src/config/file.rs	96.47% <ø> (ø)
...data_source_readers/filepath_data_source_reader.rs	0.00% <0.00%> (ø)
...ries/data_source_readers/url_data_source_reader.rs	0.00% <0.00%> (ø)
stork-lib/src/index_v3/build/fill_stems.rs	100.00% <ø> (ø)
...rk-lib/src/index_v3/search/intermediate_excerpt.rs	0.00% <ø> (ø)
stork-lib/src/input.rs	98.61% <ø> (-1.39%)	⬇️
stork-lib/src/lib.rs	35.08% <0.00%> (ø)
stork-lib/src/index_v3/search/mod.rs	78.65% <33.33%> (-17.13%)	⬇️
... and 35 more

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[github-actions]

Benchmarks

Benchmark	Baseline	Contender	Comparison
build/federalist	168.1503	166.9067	0.99× 🎉
federalist.st	1125.456	1125.456	1.0×
search/federalist/liberty	1.6067	1.5748	0.98× 🎉
stork.js	23.122	23.122	1.0×
stork.wasm	337.231	337.231	1.0×

Baseline: 8550f1f; Comparison: 39a546e