Closes #325

Refactor workflow pages. This involved combining some files and re-naming others. Keep the create workflow modal, but when editing a workflow there is no modal. There is now a page that allows for changing name/description while also adding steps/params. The workflow detail page allows for param input and executing workflow, and lists workflow steps in a concise way in case user needs reminding.

Add toast notifications for add/remove/edit step and params. This is helpful to let user know modifications are "saved" and it is safe to navigate away from page, since save button is for name/description only. Code added for success, warning, info, error toasts - can now be used for any HTMX return by adding the following to the HttpResponse or HttpResponseClientRedirect:

            headers={
                "HX-Trigger": json.dumps(
                    {
                        "showMessages": [{
                            "level": "success", // or info, warning, danger
                            "msg": "My alert.",
                        }]
                    }
                ),
            },

On edit/create view, confirm deletion of steps/params prior to actually deleting them.

Removed unused ui/urls.py definitions: all-variables, variable-detail, workflow-delete. Removed some unused CSS classes. Added class to set min width on step move column, so buttons wouldn't overlap when there are two steps and a small width.

Fixed bug on Task Detail page where the name was not showing properly.