docs: update icon

[timerring]

Description

Update icon via introducing fonts directly.

Who Can Review?

@timerring

Checklist

• Code has been reviewed
• Code complies with the project's code standards and best practices
• Code has passed all tests
• Code does not affect the normal use of existing features
• Code has been commented properly
• Documentation has been updated (if applicable)
• Demo/checkpoint has been attached (if applicable)