Add clean script to drop unused reference definitions

Author: Mark-Simulacrum

clean.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+rg '\[([^]]*)\]: ' -o release.md > defs
+rg '\[([^]]*)\]$' -o release.md > used
+
+for word in `cat defs`; do
+    pattern=$(echo "$word" | sed 's@\[@\\[@g' | sed 's@]@\\]@g' | sed 's@/@\\/@g')
+    in_used=$(echo "$word" | sed 's@:.*@@')
+    if ! fgrep -q "$in_used" used; then
+        sed -i "/^$pattern/d" release.md
+    fi
+done