Add landing pages for Espressif products

[pedrominatel]

Checklist

• Checked the issue tracker for similar issues to ensure this is not a duplicate.
• Described the feature in detail and justified the reason for the request.
• Provided specific use cases and examples.

Feature description

Add the landing pages to the tags

Use cases

https://developer.espressif.com/esp-insights should open the tag index page.

Alternatives

No response

Additional context

• RainMaker
• Insights
• ZeroCode
• ESP-IDF
• Registry
• Arduino

[pedrominatel]

RainMaker added: https://developer.espressif.com/tags/rainmaker/