examples : update server.py to match github pages app [no ci] #3004
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This commit updates examples/server.py which is used to serve the wasm examples locally. The changes include:
Added a redirect from the root URL to /whisper.cpp. So now accessing http://localhost:8000/ will redirect to http://localhost:8000/whisper.cpp/ which matches the url for the app deployed to github pages.
Custom handling for coi-serviceworker.js to serve it to avoid and error in the console. This file is not strictly necessary for the local server to work as the headers are provided already but it is nice to not have an error in the console.
Fixed the shutdown of the server to ensure it exits cleanly on Ctrl+C. Previously it would continue to hang onto the port even after the processed had exited.