WASM library examples require HTTPS

I found the WASM examples such as llama2-c didn't work following the given directions. The problem is that they make use of the CacheStorage API which is only available in modern browsers (e.g. Chrome, Safari) when using a secure connection. It would be helpful to mention this in the README since the current instructions of using Python's `http.server` won't work without some TLS proxy in many browsers.

Start with the README covering the WASM examples such as llama2-c and verify the current Python http.server directions. Done when it explicitly notes that CacheStorage requires a secure connection in modern browsers and explains that plain http.server may need a TLS proxy.

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