Clean workflow: check new "elements" folder (#247)
Clean workflow: check new "elements" folder (#247)

Reffy now extracts HTML elements from a few specs to an "elements" folder.

This update also makes the workflow skip non-existing folders rather than crash.
Typically, the `elements` folder has not yet been created under `tr` and that's
normal.
tidoust/reffy-reports,tidoust/reffy-reports