[Feature Request] Option for using a sidebar window or a normal window

@alphapapa Thank you for creating this package and your contributions to the emacs community.

**Background:**
In my workflow, I open up my list of tasks from an org-agenda view and use org-now-agenda-refile-to-now to focus on a subset of tasks for the day.

In the org-now sidebar window with the tasks for the day, I use org-pomodoro to work through them, clocking-in and out of the tasks, and I would like to use org-todo to mark tasks as completed.

**Problem:**
I receive an error, `"split-window: Cannot split side window or parent of side window".` I believe this is related to how org-todo creates a pop-up window that shows the TODO keywords for selection.

**Desired outcome:**
Provide the user with the option to either use the org-now sidebar window or a normal window that points to the org-now location. The latter option will allow me to use all the org related commands without the split-window problem mentioned above.

Thank you for your time and consideration.