The current documention was unclear about the full path of local mirrors
when using the XDG Base Directory Specification.
Also removed the trailing slashes for the other paths in this section.
The new nav structure demanded a few new pages that give context about a feature
or workflow. In a few cases, they take text from an existing page.
Co-authored-by: Tu Nguyen <im2nguyen@users.noreply.github.com>
Co-authored-by: Judith Malnick <judith.patudith@gmail.com>
Matthew Sanabria