XMonad - Refactor - C-; M1-e - evince with prompt to let the user
specify the books to read
XMonad - Refactor - Do not hardcode the number of workspaces
XMonad - Refactor - Move pdfreader directly to its dedicated workspace
XMonad - Refactor - Alignment
XMonad - Refactor - Improve the `C-; M-x` prompt to permit to find the
action and the associated binding