More detailed image_url information

[hosebei]

As Discussed in home-assistant/core#90121, the usage of the image_url tends to be unclear. Added detailed information of the image_url string and requirements with link to teams cards documentation

Proposed change

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 logo's 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.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[frenck]

Put this PR back into draft, as the requested change / suggestion wasn't applied or responded on. Did you forgot to push a commit maybe @hosebei?

../Frenck

[hosebei]

I'm very sorry, I thaught the buttons i pressed accepted you corrections and rerequested the merge.
I'm doing better.

[frenck]

Don't worry about it!

Thanks for the PR @hosebei 👍

../Frenck