Improve plot_titles

Improve the aesthetics and proportions of plotting, especially with dataset/date_range/baseline annotations. Currently, titles may overlap depending on the arrangement of subfigures. Also, when certain figure dimensions are used, the spacing between titles may not be suitable for the required text sizes (as per ACS comms guides)

Design aesthetics were focused on vertical orientations for 4-panel plots without these annotations for a particular report, so other arrangements are not necessarily ideal.

For example, there is overlapping text when a baseline is provided:

Steps for this may include:
* modifying xy coords for titles
* actively adjusting coords according to figure size
* fixing coords as distance from the edge of the figure, regardless of the figure size.