zk: Move nvim wiki index opening to zk module

While technically invoking nvim, it belongs more into the zk module
since it is only to be added if zk exists.

nvim/.config/sh/alias.d/neovim.sh

@@ -5,8 +5,5 @@ if exist nvim; then
     alias v="nvim"
     alias vim="nvim"
 
-    # open notes with my vim zettelkasten plugin
-    # TODO better implementation conditional on zk & zettelkasten existing
-    alias vn='nvim +"lua require \"zk.commands\".get(\"ZkCd\")()" +"edit ~/documents/notes/index.md"'
     alias vs='nvim +"lua require \"personal.scratchpad\".create()"'
 fi

writing/zk/config/sh/alias.d/zk.sh

@@ -8,3 +8,10 @@ n() {
         zk "${@}"
     fi
 }
+
+# open notes with my vim zettelkasten plugin
+# TODO better implementation conditional on zk.nvim & zettelkasten existing
+# nvim +'lua pcall(require "zk.commands"') --headless +qa 2>&1 or similar to check - but slow
+if command -v nvim >/dev/null 2>&1; then
+    alias ni='nvim +"lua require \"zk.commands\".get(\"ZkCd\")()" +"edit $WIKIROOT/index.md"'
+fi