refactor: Webfingerのルーティング定義を移動

src/main/kotlin/dev/usbharu/hideout/routing/wellknown/WebfingerRouting.kt

@@ -0,0 +1,11 @@
+package dev.usbharu.hideout.routing.wellknown
+
+import io.ktor.server.routing.*
+
+fun Routing.webfinger(){
+    route("/.well-known/webfinger"){
+        get {
+
+        }
+    }
+}