Use actix-remote-ip to reduce code base size (#5)

Use https://crates.io/crates/actix-remote-ip to remove some code redundancy

Reviewed-on: #5

templates/home.html

@@ -4,6 +4,7 @@
 <h1>Test OIDC Authentication flow.</h1>
 <p class="lead">Get started testing OIDC authentication flow</p>
 <p>Redirect URI: {{ redirect_url }}</p>
+<p>Your IP: {{ remote_ip }}</p>
 <p class="lead">
     <a href="/start" class="btn btn-lg btn-light fw-bold border-white bg-white">Start</a>
 </p>