Tips & Tricks with message.content to show camera live feed + docs

[matheusvellone]

Description

message.content allowing HTML content is very powerful and should be documented better IMO.
I was looking for a way to add the current state of my cameras on homer and now I'm finally done.

Type of change

• Docs update
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I've read & comply with the contributing guidelines
• I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• I have made corresponding changes to the documentation (README.md).
• I've checked my modifications for any breaking changes, especially in the config.yml file

[netlify]

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