make mdbook build script executable

[emuell]

No description provided.

[github-actions]

Benchmark for ea400db

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Test	Base	PR	%
Cycle/Generate	59.2±2.21µs	58.6±0.45µs	-1.01%
Cycle/Parse	341.4±8.52µs	339.7±29.63µs	-0.50%
Rust Phrase/Clone	447.5±15.05ns	452.4±5.86ns	+1.09%
Rust Phrase/Create	68.7±2.57µs	68.9±0.90µs	+0.29%
Rust Phrase/Run	701.3±9.63µs	709.0±8.45µs	+1.10%
Rust Phrase/Seek	163.0±291.55µs	163.3±309.47µs	+0.18%
Scripted Phrase/Clone	656.3±26.87ns	656.0±13.71ns	-0.05%
Scripted Phrase/Create	915.7±12.47µs	922.1±15.12µs	+0.70%
Scripted Phrase/Run	1875.4±22.02µs	1883.3±50.79µs	+0.42%
Scripted Phrase/Seek	235.2±476.23µs	237.7±483.25µs	+1.06%

[github-actions]

Benchmark for 83d4775

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Test	Base	PR	%
Cycle/Generate	58.9±0.51µs	58.5±0.41µs	-0.68%
Cycle/Parse	329.6±4.71µs	326.6±4.96µs	-0.91%
Rust Phrase/Clone	452.3±6.59ns	436.5±5.38ns	-3.49%
Rust Phrase/Create	67.7±0.85µs	67.8±1.30µs	+0.15%
Rust Phrase/Run	700.2±13.11µs	691.0±5.79µs	-1.31%
Rust Phrase/Seek	199.7±388.71µs	159.6±301.99µs	-20.08%
Scripted Phrase/Clone	645.3±8.52ns	637.5±6.32ns	-1.21%
Scripted Phrase/Create	908.1±8.79µs	910.4±10.88µs	+0.25%
Scripted Phrase/Run	1870.1±41.91µs	1891.3±36.32µs	+1.13%
Scripted Phrase/Seek	244.5±471.29µs	238.0±484.93µs	-2.66%

[github-actions]

Benchmark for 4b745b4

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Test	Base	PR	%
Cycle/Generate	59.3±0.76µs	59.0±0.42µs	-0.51%
Cycle/Parse	327.8±3.35µs	353.9±12.64µs	+7.96%
Rust Phrase/Clone	436.0±10.47ns	440.6±6.77ns	+1.06%
Rust Phrase/Create	67.4±1.16µs	72.1±1.64µs	+6.97%
Rust Phrase/Run	694.2±8.47µs	686.9±6.30µs	-1.05%
Rust Phrase/Seek	162.7±306.77µs	161.6±306.56µs	-0.68%
Scripted Phrase/Clone	649.9±7.33ns	674.5±5.97ns	+3.79%
Scripted Phrase/Create	901.7±6.44µs	904.1±9.46µs	+0.27%
Scripted Phrase/Run	1852.7±15.02µs	1893.9±29.38µs	+2.22%
Scripted Phrase/Seek	234.3±478.45µs	235.7±477.73µs	+0.60%