Change logo for embeds to one for white background [161379993]

[kilemensi]

Description

Current wazi-logo is for dark backgrounds. Rename name it wazi-logo-white to clarify this and add a new wazi-logo that works with light backgrounds.

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)
• [X] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Screenshots

Before

After

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have made corresponding changes to the documentation