Update _index.md listing nRF52 as a first-class platform

[Hedda]

Description:

Follow-up to PR https://github.com/esphome/esphome-docs/pull/5291 which only added a mentioning of "nRF52" under other microcontrollers (at the bottom of the website).

This new PR also add the nRF52 platform (Nordic Semi MCUs) to the description list at the very top of the main website/webpage.

i.e. "Turn your ESP32, ESP8266, nRF52, or RP2040 boards into powerful smart home devices with simple YAML configuration"

That is, if nRF52 is now a first-class platform, then it should probably be reflected there at the top as well.

ESPHome 2025.8.0 changelog said that it introduced comprehensive support for the nrf52 platform but if that still means that it is only ”experimental” then maybe do not list it at the top until later and thus do not yet merge this PR that change the listing(?).

"ESPHome 2025.8.0 introduces comprehensive support for Nordic nRF52 series microcontrollers ..."

For reference, initial support for nRF52 platform was added (by @tomaszduda23) to ESPHome 2025.8.0 release, see changelog:

• https://esphome.io/changelog/2025.8.0/

  • https://esphome.io/changelog/2025.8.0/#nrf52-platform-support

ESPHome 2025.9.0 changelog said that it added ”Enhanced NRF52 features”:

• https://esphome.io/changelog/2025.9.0/

Related issue (if applicable): fixes

Pull request in esphome with YAML changes (if applicable):

• esphome/esphome#<esphome PR number goes here>

Checklist:

• [ ] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• [x] I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• [ ] Link added in /components/index.rst when creating new documents for new components or cookbook.

New Component Images

If you are adding a new component to ESPHome, you can automatically generate a standardized black and white component name image for the documentation.

To generate a component image:

1. Comment on this pull request with the following command, replacing COMPONENT_NAME with your component name in UPPER_CASE format with underscores (e.g., BME280, SHT3X, DALLAS_TEMP):

   @esphomebot generate image COMPONENT_NAME
   

2. The ESPHome bot will respond with a downloadable ZIP file containing the SVG image.

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4. Use the image in your component's index table entry in /components/index.rst.

Example: For a component called "DHT22 Temperature Sensor", use:

@esphomebot generate image DHT22

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[coderabbitai[bot]]

Walkthrough

Updates SEO description in content/_index.md to include nRF52 among supported microcontrollers. No other changes.

Changes

Cohort / File(s)	Summary of Changes
Site content / SEO description content/_index.md	Updated params.seo.description text to list ESP32, ESP8266, nRF52, and RP2040 instead of ESP32, ESP8266, and RP2040.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• esphome/esphome-docs#5291 — Also updates content/_index.md regarding nRF52 and suggests adding nRF52 to the top SEO/summary, matching this change.

Suggested labels

current

Suggested reviewers

• jesserockz
• clydebarrow

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[jesserockz]

#5305

[github-actions[bot]]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days. Thank you for your contributions.

[Hedda]

What is missing for the nRF52 platform (for MCUs like nRF52840) to be listed as a first-class platform?

• OTA support?

[tomaszduda23]

Ota is there https://github.com/esphome/esphome/pull/11932. I would say zigbee and Ota.