iOS mobile view overriding site styles

[DaveSkender]

I suspect Safari / iOS overrides are taking over and doing something funny. Examples:

• When viewing the site on an iPhone 13 mini in landscape view there are white borders.
• GitHub icon is mis-colored, which may also have to do with Safari browser doing funny things with <meta name="theme-color" content="#3F51B5"> or with overriding <a> tag styles.

Recommend finding ways to take back control of those things.

[DaveSkender]

Last changes did not seem to work in fixing the GitHub logo color, or the white gutters.

[DaveSkender]

I've removed the GitHub logo, but the margin aspect persists

[DaveSkender]

This was fixed in #265