[docs] introduction for special table engines (#12170)

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* [docs] introduction for special table engines

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# Special Table Engines
There are three main categories of table engines:
- [MergeTree engine family](../../../engines/table-engines/mergetree-family/index.md) for main production use.
- [Log engine family](../../../engines/table-engines/log-family/index.md) for small temporary data.
- [Table engines for integrations](../../../engines/table-engines/integrations/index.md).
The remaining engines are unique in their purpose and are not grouped into families yet, thus they are placed in this “special” category.