lake: incremental updates 0621

[lilin90]

What is changed, added or deleted? (Required)

Introduce Kafka Consumer integration docs and reusable Kafka credentials. Adds new guides: integrate-with-kafka.md (Kafka Consumer task guide, Beta) and kafka-credentials.md (Kafka - Credentials data source).

Update TOC and related pages (data-integration-overview.md, data-sources.md, integration-tasks.md, task-management.md) to reference Kafka and describe message consumption behavior and tenant Stage usage.

Also apply minor fixes to mindsdb.md (update links and database name).

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[gemini-code-assist]

Code Review

This pull request introduces documentation for the new Kafka Consumer Integration Task and Kafka Credentials features, updating the table of contents, overview guides, and task management documentation accordingly. It also updates the MindsDB integration tutorial with corrected links and database configurations. The reviewer's feedback focuses on improving readability and adherence to the style guide, specifically by suggesting the use of active voice and second-person perspective, as well as correcting heading capitalization to sentence case.

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