As per my last commit, this icon differentiates errors from points and
still allows us to specifiy icons for errors to differentiate them amongst
eachother.
I learned quite a bit about SVGs and using them in HTML while
implementing this 😝Had some issues getting the icon to center in the
header so resorted to using a flexbox instead of absolute positioning
being used elsewhere.
This allows more diverse representation of the error subject at a glance
than relying on colour alone.
However, it would be good to have a generic error icon that can contain
icons which is differentiated from the point icon for clarity.
Sidebar header currently still uses the bolt icon until I figure out
how to deal with that. Also the font awesome icons don't seem to work,
perhaps there's additional code needed for those that I've missed.