Update README.md add site status button (brisbanesocialchess#353)

Author: jbampton

README.md

@@ -13,6 +13,7 @@ Welcome to the source code repository for the Brisbane Social Chess website.
 [![Lerna Workflow Status](https://img.shields.io/github/actions/workflow/status/brisbanesocialchess/brisbanesocialchess.github.io/.github%2Fworkflows%2Flerna.yml?label=lerna)](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/lerna.yml)
 [![Ls-lint Workflow Status](https://img.shields.io/github/actions/workflow/status/brisbanesocialchess/brisbanesocialchess.github.io/.github%2Fworkflows%2Fls-lint.yml?label=ls-lint)](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/ls-lint.yml)
 [![Pre-commit Workflow Status](https://img.shields.io/github/actions/workflow/status/brisbanesocialchess/brisbanesocialchess.github.io/.github%2Fworkflows%2Fpre-commit.yml?label=pre-commit)](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/pre-commit.yml)
+[![Website](https://img.shields.io/website?url=https%3A%2F%2Fbrisbanesocialchess.github.io)](https://brisbanesocialchess.github.io)
 [![Wrangler Workflow Status](https://img.shields.io/github/actions/workflow/status/brisbanesocialchess/brisbanesocialchess.github.io/.github%2Fworkflows%2Fwrangler.yml?label=wrangler)](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/wrangler.yml)
 
 - **Live site:** [https://www.brisbanesocialchess.org.au/](https://www.brisbanesocialchess.org.au/)