homogeneise maps

[LBeaulaton]

can we provide function to have the same looking for the maps (maybe already done, but need to use them)

[LBeaulaton]

check : R/utilities/plot_map_series.R and R/utilities/get_background_map.R

[Nojani]

• Check if function already exists. If not, create it so that same colors are used throughout the report (when possible). Can potentially also be used for other figures (e.g. if using the same ecoregions in graphs).
• Make sure they are suitable for color vision deficiency (CVD)
• Think about shapes, for e.g. different series
• Think about e.g. colors for different ecoregions (and what other areas are used in report)
• Define map legends clearly
• Define map size and how to crop europe
• Choose background map that is used in all maps
• define what scale is used and what is shown as the grid (e.g. WGS84 coordinates on the sides?). Define which projection is used.

[elfunesto]

See #300 that is related to the issue