Update dotfile application to check for prereqs

install.sh

@@ -47,5 +47,12 @@ shopt -u nocasematch
 
 # Apply the dotfiles with stow
 echo "Running apply dotfiles"
-./apply-dotfiles
+if which stow &> /dev/null; then
+  ./apply-dotfiles
+elif which nix &> /dev/null; then
+  ./apply-dotfiles-nix
+else
+  echo "Tools for installing dotfiles are unavailable, failing..."
+  exit 1
+fi
 echo "Dotfiles applied successfully"