Add build and preview script

build.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+if [ "$(uname)" == "Darwin" ]; then
+    # Running on macOS.
+    # Let's assume that the user has the Docker CE installed
+    # which doesn't require a root password.
+    docker run --rm -it -v $(pwd):/antora antora/antora --html-url-extension-style=indexify site.yml
+
+elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
+    # Running on Linux.
+    # Let's assume that it's running the Docker deamon
+    # which requires root.
+    echo ""
+    echo "This build script is using Docker to run the build in an isolated environment. You might be asked for a root password in order to start it."
+sudo docker run --rm -it -v $(pwd):/antora:z antora/antora --html-url-extension-style=indexify site.yml
+fi