sh: Add missing vim aliases

Added some simple aliases that were missing from the vi → vim → neovim
chain.
Can be useful for the odd moment when one does not know which exact vim
is installed.

sh/.config/sh/alias

@@ -11,10 +11,12 @@ unalias -a
 if exist nvim; then
     alias v="nvim"
     alias vs="nvim -c 'ScratchPad'"
+    alias vim="nvim"
 elif exist vim; then
     alias v="vim"
 else
     alias v="vi"
+    alias vim="vi"
 fi
 
 # exit shell mimicks vim