Add information about Shelly actions

[bieniu]

Proposed change

Add information about actions:

• shelly.get_kvs_value
• shelly.set_kvs_value

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Add get_kvs_value and set_kvs_value actions for Shelly RPC devices core#157349
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

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[Copilot]

Pull request overview

This PR adds documentation for two new Shelly integration actions: shelly.get_kvs_value and shelly.set_kvs_value. These actions enable users to interact with the Key-Value Storage (KVS) on Gen2+ Shelly devices, allowing them to retrieve and store custom data values.

Key changes

• Added documentation for two new actions that interact with device Key-Value Storage
• Included a practical YAML example showing how to create a template sensor using the get_kvs_value action
• Structured the action documentation following the standard format with data attributes and descriptions

[c0ffeeca7]

Thank you, @bieniu and @thecode 👍