Set up flit post-processing for HTML

game_core/Trunk.toml

 [build]
-public_url = "./"
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+public_url = "/"
+
+[[hooks]]
+stage = "post_build"
+command = "sh"
+command_arguments = ["-c", "flit -i $TRUNK_STAGING_DIR/index.html -f $TRUNK_SOURCE_DIR/flit.toml --inline"]
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game_core/flit.toml

+["script[type='module']"]
+action = "wrap"
+template ='''
+<div id="root">
+	<button id="start_game">Start Game</button>
+</div>
+<script>
+document.addEventListener('DOMContentLoaded', () => {
+  	document.getElementById('start_game').addEventListener('click', function() {
+  		let element = document.createElement('{{{TAG}}}');
+  		let attr_string = `{{{ATTR}}}`
+  		attr_string.split(' ').forEach(function(attr) {
+  			let attr_array = attr.split('=');
+  			element.setAttribute(attr_array[0], attr_array[1].slice(1, -1));
+  		});
+  		element.innerHTML = `{{{CONTENT}}}`;
+  		document.body.appendChild(element);
+
+  	});
+});
+</script>'''
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