Refactor examples list in CMake (#170)

* Reduce example list duplication

* Add COEP and COOP headers in local HTTP server

* Revert Examples URL in readme

examples/run_webassembly.py

@@ -0,0 +1,20 @@
+#! /usr/bin/python3
+from http.server import HTTPServer, SimpleHTTPRequestHandler
+import sys
+import webbrowser
+
+PORT = 8888
+
+class CustomHTTPRequestHandler(SimpleHTTPRequestHandler):
+    def end_headers(self):
+        self.send_header("cross-origin-embedder-policy", "require-corp")
+        self.send_header("cross-origin-opener-policy", "same-origin")
+        SimpleHTTPRequestHandler.end_headers(self)
+
+with HTTPServer(("", PORT), CustomHTTPRequestHandler) as httpd:
+    try:
+        webbrowser.open("http://localhost:%s" % PORT)
+        print("serving at port", PORT)
+        httpd.serve_forever()
+    finally:
+        sys.exit(0)