Update index.md

[brian32768]

This adds support for a newer version of this switch, that has a BK7231T based MCU. So I documented the pin numbers and added a YAML file.

Brief description of the changes

Added board type, pinouts, and example YAML config

Type of changes

• [ ] New device
• [X ] Update existing device
• [ ] Removing a device
• [ ] General cleanup
• [ ] Other

Checklist:

• [X ] There are no passwords or secrets references in any examples. The only exceptions are !secret wifi_ssid and !secret wifi_password.
• [X ] The wifi or ethernet block has no static / manual ip address specified.
• [ X] The first configuration provided should be hardware definitions only. A more involved example can be provided in a separate configuration block.

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