Refactor dependencies to reduce code base size (#111)

Use crates to reduce code base size :

* `actix-remote-ip` to safely determine user IP location
* `light-openid` for the OpenID primitives & as client to handle federation

Reviewed-on: #111

Cargo.toml

@@ -10,6 +10,7 @@ actix = "0.13.0"
 actix-identity = "0.5.2"
 actix-web = "4"
 actix-session = { version = "0.7.2", features = ["cookie-session"] }
+actix-remote-ip = "0.1.0"
 clap = { version = "4.2.1", features = ["derive", "env"] }
 include_dir = "0.7.3"
 log = "0.4.17"
@@ -34,8 +35,7 @@ base32 = "0.4.0"
 qrcode-generator = "4.1.8"
 webauthn-rs = { version = "0.4.8", features = ["danger-allow-state-serialisation"] }
 url = "2.3.1"
-aes-gcm = { version = "0.10.1", features = ["aes"] }
+light-openid = { version = "1.0.1", features=["crypto-wrapper"] }
 bincode = "2.0.0-rc.3"
 chrono = "0.4.24"
-lazy_static = "1.4.0"
-reqwest = { version = "0.11.16", features = ["json"] }
+lazy_static = "1.4.0"