Define github actions workflows and publish binaries artifacts

Among the definition of github actions I've cleanup
* the build of examples as the project does not publish any example
* the usage of env variables in makefile
* the usage of `-Zunstable-options` in windows build (as no longer needed)

Make TLS support optional

Feature | Open in default browser

Responsive web

add command-line option to specify upload file size limit

Update dependencies

check format input auth is valid

Fix: #13

Update dependencies

Update README + redirect help message

 Update to Rust 2018 edition