Enable site deploy preview for pull requests

Signed-off-by: Khosrow Moossavi <khos2ow@gmail.com>

scripts/docs/prepare-site.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+#
+# Copyright 2021 The terraform-docs Authors.
+#
+# Licensed under the MIT license (the "License"); you may not
+# use this file except in compliance with the License.
+#
+# You may obtain a copy of the License at the LICENSE file in
+# the root directory of this source tree.
+
+set -o errexit
+set -o pipefail
+
+PWD=$(cd "$(dirname "$0")" && pwd -P)
+PWD="${PWD}/../.."
+
+# Make sure site/ folder does not exist
+rm -rf "${PWD}"/site
+
+# Clone the website repository locally
+git clone -b main https://github.com/terraform-docs/website "${PWD}"/site
+
+# Update website content
+rm -rf "${PWD}"/site/content/
+cp -r "${PWD}"/docs/ "${PWD}"/site/content/