* [FEATURE] Embed static assets in Go binary
* Refactor/consolidate code and specify public_html via configuration
* Update docs and config template for assets
* Update AUR package pre-requisites and systemd unit
* Include static assets as Buildkite and GitHub artifacts
* Remove references to PUBLIC_DIR
* Only serve assets via embedded filesystem and remove configuration references
* Update authelia-scripts helper to build the embedded filesystem
* Mock the embedded filesystem for unit tests
Add to gitignore to ensure this isn't overwritten.
* Move go:generate to satisfy linter
CSP is used to avoid some attacks where the hacker tries to execute
untrusted code in the browser.
The policy is to use assets hosted on the the original website and in order to make CSP work with material UI, a nonce is generated at each request of index.html and injected in the template as well as provided in the Content-Security-Policy header (https://material-ui.com/styles/advanced/#how-does-one-implement-csp)
Fix#815
