Add a new entry in `runtime_options.json` to set the amount of genes to be plotted by `fade_plots`

[Feat-FeAR]

In this lines

Endothelion/src/endo_profiler.R

Lines 288 to 292 in d0a572f

	average_expression |>
	select(c("SYMBOL", "Mean")) |>
	filter(Mean >= 0.1) |>
	merge(matrix_of_means, by = "SYMBOL", all.y = FALSE) |>
	arrange(desc(Mean)) -> matrix_of_means

the filter level should be fetched from runtime_options.json.