enhancement-Make the text on the navbar lighter

[SamantaTarun]

Is your feature request related to a problem? Please describe. No, it is a modification to improve the user experience and text readability on the navbar in Dark mode.

Describe the solution you'd like After conducting various tests, I believe that the best color for the text on the navbar is:

e7e7e7

Unlike the original color, which is a bit darker, this color provides a more immediate reading of the various elements on the navbar.

135

@tarunsamanta2k20

[FlavioAdamo]

PR accepted! Thanks for the contribution!