sh: Add flexible vi/vim/nvim invocation

`v` used to call nvim and nothing else.
Now, it checks for nvim and calls that,
checks for vim and calls that,
or checks for vi and calls that before failing.

sh/.config/sh/alias

@@ -8,7 +8,14 @@ exist() { type "$1" >/dev/null 2>&1; }
 unalias -a
 
 # v shorthand for neovim
+if exist nvim; then
   alias v="nvim"
+  alias vs="nvim -c 'ScratchPad'"
+elif exist vim; then
+  alias v="vim"
+else
+  alias v="vi"
+fi
 
 # exit shell mimicks vim
 alias :q="exit"