docs: Underline link when hovering over it
docs: Underline link when hovering over it

In addition to the pointer, this gives some visual feedback to the user
that the element is interactive. This is a very common style pattern
across the web.

raulgrell/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,andrewrk/zig,andrewrk/zig,zig-lang/zig,raulgrell/zig