To make NavBar text more clearly visible.

[himanishu-2512]

Describe the bug
To make NavBar text more clearly visible.

Due to bad color combination it is not properly readable.
Expected behavior

I will change the color of text and background to this.

**Screenshots (optional)**

This is the Screenshot of before one.
Swasthify — Before
This the screenshot after implementing the code
Swasthify —After

Additional context (optional )

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[himanishu-2512]

@pranjay-poddar Please assign me this under the hacktoberfest.

[himanishu-2512]

I have created a PR. Please review it @pranjay-poddar .

[himanishu-2512]

@pranjay-poddar Please review it.