Output:
#+CAPTION: Example plot with 2 facets labelled Segment B and Segment A.
#+ATTR_HTML: :class img-fluid :alt Example plot with 2 facets labelled Segment B and Segment A.
-[[file:assets/2016-10-05_R-facet.png]]
+[[file:../assets/2016-10-05_R-facet.png]]