Major config overhaul: use custom modules, setup for multi-host config, and less boilerplate

modules/user/ranger/README.org

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+#+title: Ranger File Manager
+#+author: Emmet
+
+* What is Ranger?
+[[https://ranger.github.io/][Ranger]] is a minimalistic TUI file manager controlled with vim keybindings (making it /extremely/ efficient).
+
+[[https://raw.githubusercontent.com/librephoenix/nixos-config-screenshots/main/app/ranger.png]]
+
+If you've never tried a terminal file manager, I suggest you try it out. Here's a quick overview of how to work with it:
+- =j= and =k= - Move up and down
+- =l= - Move into a directory or open file at point
+- =h= - Move up a directory
+- =g g= - Move to top
+- =G= - Move to bottom
+- =SPC= - Mark a file
+- =y y= - Copy (yank) file(s)
+- =d d= - Cut file(s)
+- =p p= - Paste file(s)
+- =d T= - Trash file(s)
+- =d D= - /Delete/ a file (no undo!)
+- =!= - Run a shell command in current directory
+- =@= - Run a shell command on file(s)
+- =Ctrl-r= - Refresh view
+
+Just like in vim, commands can be given by typing a colon =:= (semicolons =;= also work in ranger!) and typing the command, i.e =:rename newfilename=.