[style]: Add Missing Color Style for Chat Button in Privacy-Policy Page for Dark Mode Compatibility

[akshay0611]

What's the style idea?

We need to improve the readability of the "Chat with ArthaSathi 💬" button in the privacy-policy.html page when dark mode is enabled. The button's text is currently unreadable because the color: white; style is missing, which is already applied on other pages like index.html. Adding this style will make the button text visible and consistent across the site in dark mode.

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Before Fix:

After Fix:

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• [ ] I'm a GSSoC'24 contributor
• [X] I want to work on this issue

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