Pandas version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Location of the documentation

https://pandas.pydata.org/docs/getting_started/index.html#intro-to-pandas

Documentation problem

In dark mode, the text within the tutorial navigation boxes under "Intro to pandas" has low contrast against the background, making it difficult to read.

Suggested fix for documentation

Lighten the font color to #CED6DD which matches the color of other texts in dark mode.