sh: Add default open script

Simple wrapper for xdg-open functionality. Simply refers
to xdg-open except if there exists mimeo on the system
which it will refer to instead.

So, a simple preference modificator for mimeo over
xdg-open since that is my preference too.

Also gave it a short name so I can do open whenever I
want and don't have to tax my left hand with tying xdg.

writing/.config/pubs/pubsrc

@@ -12,7 +12,7 @@ docsdir = ~/documents/library/doc
 doc_add = copy
 
 # the command to use when opening document files
-open_cmd = xdg-open
+open_cmd = open
 
 # which editor to use when editing bibtex files.
 # if using a graphical editor, use the --wait or --block option, i.e.:

writing/.local/bin/rofi-bib-due

@@ -26,4 +26,4 @@ key=$(echo "$choice" | sed -E 's/.*\((\w+)\)$/\1/')
 library="$(dirname "$(realpath "$BIBFILE")")/pdf"
 
 # find and open the key-associated pdf file
-${FILEREADER:-xdg-open} "$(find "$library" -type f -name "$key *.pdf")"
+${FILEREADER:-open} "$(find "$library" -type f -name "$key *.pdf")"