Add SmartThings community Discord link

[mik-laj]

Proposed change

Discord discussions: https://discord.com/channels/330944238910963714/1475552849835458691/1477471462029004984

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:
• 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 updates the SmartThings integration documentation to add a dedicated “SmartThings community” section that directs readers to a Discord community for peer support and discussion.

Changes:

• Added a new “SmartThings community” section to the SmartThings integration docs.
• Included a Discord invite link for SmartThings-focused community discussion.