Replace String by AccountProvider to be able to get baseUrl and serverName.

appconfig/src/main/kotlin/io/element/android/appconfig/AuthenticationConfig.kt

@@ -9,15 +9,8 @@
 package io.element.android.appconfig
 
 object AuthenticationConfig {
-    const val MATRIX_ORG_URL = "https://matrix.org"
-
     /**
      * URL with some docs that explain what's sliding sync and how to add it to your home server.
      */
     const val SLIDING_SYNC_READ_MORE_URL = "https://github.com/matrix-org/sliding-sync/blob/main/docs/Landing.md"
-
-    /**
-     * Force a sliding sync proxy url, if not null, the proxy url in the .well-known file will be ignored.
-     */
-    val SLIDING_SYNC_PROXY_URL: String? = null
 }