feat(auth): Add Authorization Code Flow and new Keycloak recipes with new video tutorials (#4234)

Co-authored-by: Alireza <ar.sedghi@gmail.com>

platform/app/.recipes/Nginx-Dcm4chee-Keycloak/config/oauth2-proxy.cfg

@@ -0,0 +1,22 @@
+http_address="0.0.0.0:4180"
+cookie_secret="GENERATEACOOKIESECRET----------------------="
+email_domains=["*"]
+cookie_secure="false"
+cookie_expire="9m30s"
+cookie_refresh="5m"
+client_secret="2Xtlde7aozdkzzYHdIxQNfPDr0wNPTgg"
+client_id="ohif_viewer"
+redirect_url="http://YOUR_DOMAIN/oauth2/callback"
+
+ssl_insecure_skip_verify = true
+insecure_oidc_allow_unverified_email = true
+pass_access_token = true
+provider="keycloak-oidc"
+provider_display_name="Keycloak"
+user_id_claim="oid"
+oidc_email_claim="sub"
+scope="openid"
+pass_host_header=true
+code_challenge_method="S256"
+oidc_issuer_url="http://YOUR_DOMAIN/keycloak/realms/ohif"
+insecure_oidc_skip_issuer_verification = true