Change to public folder in with-loading example

[ismamz]

No description provided.

[Janpot]

@ismamz @lfades Looks like there's a few more examples where static folder is still being used:

$ find examples/*/static/*
examples/blog-starter/static/_jolvera.png
examples/blog-starter/static/favicon.ico
examples/blog-starter/static/next.svg
examples/blog-starter/static/site-feature.png
examples/with-algolia-react-instantsearch/static/favicon.ico
examples/with-algolia-react-instantsearch/static/instantsearch.css
examples/with-asset-imports/static/logo.png
examples/with-carbon-components/static/export.scss
examples/with-carbon-components/static/myCustomTheme.scss
examples/with-firebase-cloud-messaging/static/firebase-messaging-sw.js
examples/with-loading/static/nprogress.css
examples/with-noscript/static/img
examples/with-noscript/static/img/nextjs.png
examples/with-noscript/static/img/angular.jpg
examples/with-noscript/static/img/reactjs.png
examples/with-noscript/static/img/vuejs.png
examples/with-react-md/static/react-md.light_blue-yellow.min.css
examples/with-react-toolbox/static/theme.css
examples/with-react-toolbox/static/theme.js