Remove deprecated figures.

Notebooks/Figures/pr_mean_annual_cycle.png

Notebooks/Figures/pr_r2.pdf

Notebooks/Figures/pr_r2.png

Notebooks/Figures/pr_rbias_ERA_vs_model.png

Notebooks/Figures/tasmax_average_bias.png

Notebooks/Figures/tasmax_average_bias_p98.png

Notebooks/Figures/tasmax_average_bias_seasonal.png

Notebooks/Figures/tasmax_mean_annual_cycle.png

Notebooks/Figures/tasmax_r2.pdf

Notebooks/Figures/tasmax_r2.png

Notebooks/Figures/tasmin_average_bias.png

Notebooks/Figures/tasmin_average_bias_extreme.png

Notebooks/Figures/tasmin_average_bias_p2.png

Notebooks/Figures/tasmin_average_bias_seasonal.png

Notebooks/Figures/tasmin_mean_annual_cycle.png

Notebooks/Figures/tasmin_r2.pdf

Notebooks/Figures/tasmin_r2.png