docs: enable site search via @antora/lunr-extension - #428

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4, actions/upload-artifact@v4, alandefreitas/cpp-actions/boost-clone@v1.9.0, alandefreitas/cpp-actions/package-install@v1.9.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

[doc_lint D2] tutorial/concept page has no include::example$

[doc_lint B2] raw code, not include::example$/role=pseudocode/role=external

[sentence_length C2] sentence over 25 words (36)

[sentence_length C2] sentence over 25 words (27)

[sentence_length C2] sentence over 25 words (39)

[sentence_length C2] sentence over 25 words (26)

[sentence_length C2] sentence over 25 words (36)

[vale_adoc Capy.SimpleTense] Avoid needless future/perfect tense — prefer present simple (style guide C4): 'will '.

[vale_adoc Capy.NoFluff] Filler/fluff — delete or rewrite (style guide C5/C9): 'utilize'.

[vale_adoc Capy.NoFluff] Filler/fluff — delete or rewrite (style guide C5/C9): 'in order to'.