remove vim/ and add symlinks

Remove the vim configuration files from the repository. I have moved fully over
to neovim and so these configuration files have stagnated. Instead, let's symlink the
neovim config for vim

* remove vim/
* add symlinking code in install/link.sh to symlink neovim config for vim
* symlink config/nvim -> ~/.vim
* symlink config/nvim/init.vim -> ~/.vimrc
* Remove old/outdated info from README
* Revise Vim and Neovim section of README

install/link.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env zsh
 
 DOTFILES=$HOME/.dotfiles
 
@@ -31,3 +31,25 @@ for config in $DOTFILES/config/*; do
         ln -s $config $target
     fi
 done
+
+# create vim symlinks
+# As I have moved off of vim as my full time editor in favor of neovim,
+# I feel it doesn't make sense to leave my vimrc intact in the dotfiles repo
+# as it is not really being actively maintained. However, I would still
+# like to configure vim, so lets symlink ~/.vimrc and ~/.vim over to their
+# neovim equivalent.
+
+echo "\nCreating vim symlinks"
+echo "=============================="
+
+typeset -A vimfiles=(~/.vim $DOTFILES/config/nvim ~/.vimrc $DOTFILES/config/nvim/init.vim)
+
+for file in "${(@k)vimfiles}"; do
+    # echo "$file -> $vimfiles[$file]"
+    if [ -e ${file} ]; then
+        echo "${file} already exists... skipping"
+    else
+        echo "Creating symlink for $file"
+        ln -s $vimfiles[$file] $file
+    fi
+done