Improve the CD workflow and enhance the related tools.

tools/test.sh

@@ -4,7 +4,7 @@
 #
 # Requirement: https://github.com/gjtorikian/html-proofer
 #
-# Usage: bash /path/to/test.sh
+# Usage: bash /path/to/test.sh [indicated path]
 #
 # v2.0
 # https://github.com/cotes2020/jekyll-theme-chirpy
@@ -14,6 +14,10 @@
 DEST=_site
 URL_IGNORE=cdn.jsdelivr.net
 
+if [[ -n $1 && -d $1 ]]; then
+  DEST=$1
+fi
+
 bundle exec htmlproofer $DEST \
   --disable-external \
   --check-html \