refactor: restore shell script extensions

Without an extension, the shell script configuration in `.gitattribute` will not work.

tools/run.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+#
+# Run jekyll serve and then launch the site
+
+prod=false
+command="bundle exec jekyll s -l"
+host="127.0.0.1"
+
+help() {
+  echo "Usage:"
+  echo
+  echo "   bash /path/to/run [options]"
+  echo
+  echo "Options:"
+  echo "     -H, --host [HOST]    Host to bind to."
+  echo "     -p, --production     Run Jekyll in 'production' mode."
+  echo "     -h, --help           Print this help information."
+}
+
+while (($#)); do
+  opt="$1"
+  case $opt in
+  -H | --host)
+    host="$2"
+    shift 2
+    ;;
+  -p | --production)
+    prod=true
+    shift
+    ;;
+  -h | --help)
+    help
+    exit 0
+    ;;
+  *)
+    echo -e "> Unknown option: '$opt'\n"
+    help
+    exit 1
+    ;;
+  esac
+done
+
+command="$command -H $host"
+
+if $prod; then
+  command="JEKYLL_ENV=production $command"
+fi
+
+echo -e "\n> $command\n"
+eval "$command"