Fixed navigation menu nav links color

[gabo1208]

Expected Behavior

• Navigation nav links should be visible to the user

Actual Behavior

• Nav links are invisible except for the active one

Steps to Reproduce the Problem

1. Go to a mobile resolution
2. Open the top nav menu

[gabo1208]

/assign @gabo1208
/kind mkdocs

[omerbensaadon]

Fixed by #3571

[omerbensaadon]

Somehow, this problem is back?

[gabo1208]

Seems that some css broke the "inherit" color for the nav item links, fixing it