zsh: use nvim instead of vim when available

zsh/aliases.zsh

@@ -45,6 +45,11 @@ alias grep='grep --binary-files=without-match -H -n --color=always'
 alias less='less -r'
 alias cp='cp -i'
 alias mv='mv -i'
+# use nvim instead of vim when available
+if type nvim >/dev/null 2>&1; then
+alias vi='vim'
+alias vim='nvim'
+fi
 alias automake='{ while true; do inotifywait -r -e modify . && make; done; } &'
 
 # ===== sp aliases