Add theme color meta tag (Feature request).

[george-bobby]

Copy of #465 (Sorry I didn't saw the discussions tab)
Not an issue, a feature request.
Please create a checkbox for adding theme color. Like,
<meta name="theme-color" content="#fafafa">

MDN Reference - https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta/name/theme-color

[george-bobby]

Now on PR #467

[josephmoleka]

Hello brother