docs(FEA-2096): remove chapterization from documentation

[rpiotaix]

Chapterization is discontinued (FEA-2096). The API still accepts the chapterization flag but ignores it: pre-recorded results no longer contain a chapterization block, and live sessions no longer send post_chapterization. The docs still advertised the feature.

This PR removes:

• the feature page, its cards on the three audio intelligence overviews, and its nav entries
• the post_chapterization live message and callback pages, plus the message, operation, schema, and final-transcript result block in asyncapi.yaml

The callback page reads CallbackLivePostChapterizationMessage from api.gladia.io/openapi.json, which no longer defines it, so that page was already rendering empty.

Worth a look

• Redirects in docs.json. Old chapterization URLs, including the two existing live and pre-recorded redirects, now point to Audio-to-LLM. The removed reference pages redirect to their post-summarization siblings.
• Note on the Audio-to-LLM page. It says the parameter is ignored and gives a chapter prompt, so readers who follow an old link understand why they landed there.

chapterization_time in the v1 migration guide stays: it shows a historical v1 payload.

How to verify

mint broken-links (mint 4.2.114, same as CI) reports no broken links.

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