Changes:
- Migrates `email` example project to `3.0` from `2.0`
- Replaces `inline-css` dependency with `juice` package instead.
- Replaces `Handlebars` dependency with `ejs` package instead.
Reason for replacing packages:
- Both `inline-css` & `Handlebars` had issues with Nextjs and its
Webpack bundling i.e does not support `require.extensions`.
- `ejs` & `juice` do not rely on `require.extensions`.
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