[Feature request] Ability to use images in customer containers' custom title

[thdoan]

Is your feature request related to a problem? Please describe.

Sometimes emojis don't cut it, so it would be awesome to have the ability to use images in customer containers' custom title.

Describe the solution you'd like

::: tip ![custom tip icon](/tip.svg) TIP
This is a tip.
:::

Describe alternatives you've considered

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the docs.
• Read the Contributing Guidelines.
• Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.