* ci : add github pages workflow for wasm examples
This commit adds a github workflow to build and deploy the wasm examples
to github pages. The whisper.wasm example is deployed as the main page.
This workflow is trigged by a push to master and will deploy the
examples to: https://ggerganov.github.io/whisper.cpp/.
This requires that the repository has enabled github actions in
`Settings` -> `Pages` -> `Build and deployment` -> `Source` be set to
`GitHub Actions`.
One thing to note is that this commit removes the `talk` example as I'm
not sure how this example is built yet.
Refs: https://github.com/ggerganov/whisper.cpp/issues/2784
