Readme text is white on light grey

Steps to reproduce:

1. Create a new project, ensure you are in editor light mode.
2. Download and import Dragon Crashers.
3. Observe Readme/Welcome in Dragon Crashers.

Actual results: Text is white on light grey, which is hard to read in light mode. This is an accessibility issue.

Expected results: No issues with text readability, similar to how it is in dark mode.

Reproducible with versions: 6000.1.0a9, 6000.0.31f1

Tested on (OS): Windows 10

Notes:

• Below U6 does not have this problem, but the Readme is also different.
• Same thing happened with Lost Crypt when the new welcome was added. [Internal link]
• Same thing happened with Happy Harvest [Internal link]