docs: container block docs and examples

[nperez0111]

Part 3 of 3 of the container blocks stack (1: core API, 2: multi-column migration, 3: docs & examples ← you are here). Stacked on #2998.

What this adds

• Docs: a new Container Blocks feature page covering the children config, both container shapes, boundaries, repair, parsing, and exporter mappings; small pointer updates to the Custom Blocks and Manipulating Blocks pages.
• Example: Container Block (09-container-block): a Notion-style callout that holds child blocks, plus the "string prop slot" pattern for its title.
• Example: Table Built From Container Blocks (12-container-table): BlockNote's table rebuilt as four container blocks (table/tableRow/tableCell/tableHeader) with boundary: "sealed" cells that can hold arbitrary blocks - no prosemirror-tables involved.
• Regenerated playground/src/examples.gen.tsx and the lockfile entries for the two new example packages.

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