Revert "Embed cleanup.sh in the action"

This reverts commit 9cafc4dd4c.

.github/workflows/build_doc.yml

@@ -195,24 +195,7 @@ jobs:
             done
             cd ./cgal.github.io
             echo "<li><a href=https://cgal.github.io/${PR_NUMBER}/$ROUND/Manual/index.html>Manual for PR ${PR_NUMBER} ($ROUND).</a></li>" >> ./index.html
-
-            exit_code=0
-            for d in */; do
-                    pr=${d%/}
-                    STATE=$(GH_REPO=CGAL/cgal gh pr view "$pr" --json state --jq .state)
-                    if [ $? -ne 0 ]; then
-                            >&2 echo "ERROR: Failed to retrieve state for #$pr"
-                            exit_code=1
-                            continue
-                    fi
-                    echo "#$pr: $STATE"
-                    if [ "$STATE" != "OPEN" ]; then
-                            echo "-> Deleting ./$pr/"
-                            git rm -rf --quiet "./$pr" || >&2 echo "ERROR: Failed to delete ./$pr/" && exit_code=1
-                            sed -e "/$pr/d" -i index.html || >&2 echo "ERROR: Failed to remove $pr from index.html" && exit_code=1
-                    fi
-            done
-            cat index.html | grep -F "$(echo */ | tr ' ' '\n')" > index.html
+            ./cleanup.bash
             git add ${PR_NUMBER}/$ROUND index.html && git commit -q --amend -m "sole commit" && git push -q -f -u origin master
           else
             echo "DoxygenError=This round already exists. Overwrite it with /force-build." >> $GITHUB_OUTPUT