* Removing dom ID requirement for margin/sidenotes
Prior to this commit, when using the `marginnote` or `sidenote`
shortcodes, you would need to pass a domId parameter to the shortcode.
With this change you no longer need to pass a parameter, and any
parameter passed is ignored. The pre-amble creates a unique domID for
the shortcodes.
* Replacing convoluted Scratch with Ordinal
I was leveraging the Scratch function of Hugo, when I could instead
rely on `.Ordinal`
