Previously the issuer url was received as an http::Uri.
When it was converted into a String, a `/` was appended which caused the
IssuerURL validation check in openidconnect to fail.
Now the IssuerURL is received as a String.
Previously the redirect_uri was the uri of the handler that needed
authentication.
Now one fixed redirect_uri for the entire application is used that will
redirect the user to the correct handler after successful
authentication.
This commit should fix: #28, #27, #26, #21
The previous generator functions for `OidcClient` have been replaced by
a Builder.
With this change the suggested changes by #14 and #21 have been
implemented.
Adds automated CI integration tests to the basic example.
The integration tests launch and configure a keycloak server, launch the
example and test its functionality with a headless browser.