move "inbreeding" snippets from README to real scripts

bins/inbreeding/scripts/plot.nu

+use ../src/.nushell/consts.nu CACHE
+use ../
+
+const FIGURES_DIR = ($CACHE | path join figures)
+
+mkdir $FIGURES_DIR
+
+for exp in (inbreeding list) {
+    let img = $FIGURES_DIR | path join $exp | path parse --extension '' | update extension "png" | path join
+    inbreeding load $exp | inbreeding plot --save $img
+}