feat: add brand icons for IDP, password vaults and media apps

Auth/SSO: Keycloak, Authentik, Okta, Auth0 (Authelia already present)
Password vaults: Vaultwarden, Bitwarden, 1Password, KeePassXC, HashiCorp Vault
Media/torrent: Radarr, Sonarr, Transmission

Jackett, Zitadel and Prowlarr are absent from simple-icons.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -297,7 +297,16 @@ Multiple logos can appear simultaneously if several keywords match.
 | Network | OpenWrt | `openwrt` |
 | Web / proxy | Apache | `apache`, `apache2`, `httpd` |
 | Web / proxy | Traefik | `traefik` |
-| Web / proxy | Authelia | `authelia` |
+| Auth / SSO | Authelia | `authelia` |
+| Auth / SSO | Keycloak | `keycloak` |
+| Auth / SSO | Authentik | `authentik` |
+| Auth / SSO | Okta | `okta` |
+| Auth / SSO | Auth0 | `auth0` |
+| Password vault | Vaultwarden | `vaultwarden` |
+| Password vault | Bitwarden | `bitwarden` |
+| Password vault | 1Password | `1password`, `onepassword` |
+| Password vault | KeePassXC | `keepass`, `keepassxc` |
+| Password vault | HashiCorp Vault | `hashicorp vault`, `hashicorp` |
 | Database | MariaDB | `mariadb` |
 | Orchestration | Kubernetes | `kubernetes`, `k8s`, `kubectl`, `k3s` |
 | OS | Debian | `debian` |
@@ -313,6 +322,9 @@ Multiple logos can appear simultaneously if several keywords match.
 | Self-hosted | Paperless-NGX | `paperless`, `paperless-ngx` |
 | Self-hosted | Uptime Kuma | `uptime-kuma`, `uptime kuma` |
 | Self-hosted | MkDocs | `mkdocs` |
+| Media / torrent | Radarr | `radarr` |
+| Media / torrent | Sonarr | `sonarr` |
+| Media / torrent | Transmission | `transmission` |
 | Media / home automation | Jellyfin | `jellyfin` |
 | Media / home automation | Home Assistant | `homeassistant`, `home assistant`, `hassio` |
 | Media / home automation | Philips Hue | `philips hue`, `hue bridge` |