refine linkcheck

Author: bckohan

check.sh

@@ -22,7 +22,7 @@ poetry run doc8 --ignore-path build --max-line-length 100 -q
 set +e
 poetry run sphinx-build -b linkcheck -q -D linkcheck_timeout=5 ./source ./build > /dev/null 2>&1
 if [ $? -ne 0 ]; then
-    cat ./build/output.txt
+    cat ./build/output.txt | grep broken
     exit 1
 fi
 #################################################