Style: impossible to distinguish some links

[timvisee]

In the current documentation, it is hard or impossible to distinguish some links.

In alert banners here:

or:

Or here where I don't find it immediately clear that .pem is a literal and mkcert is a clickable link:

I suggest two changes:

• underline links
• tweak links colors (different link color in banner, different banner text color, or different link color overall)

[davidmyriel]

will address in new document repo, thank you