added netlify.toml for #5

[u-ecmaker]

added toml https://stackoverflow.com/questions/58065603/netlify-renders-404-on-page-refresh-using-react-and-react-router

[netlify[bot]]

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[u-ecmaker]

だめでしたOTL

[u-ecmaker]

なぜかリビルドされなかったので一旦クローズします