Remove not used entity.

MastodonKit/Sources/MastodonKit/Entities/AccessToken.swift

@@ -1,24 +0,0 @@
-//
-//  https://mczachurski.dev
-//  Copyright © 2022 Marcin Czachurski and the repository contributors.
-//  Licensed under the MIT License.
-//
-
-import Foundation
-import OAuthSwift
-
-/// Access token returned by the server.
-public struct AccessToken: Codable {
-    
-    /// Access token.
-    public let token: String
-    
-    private enum CodingKeys: String, CodingKey {
-        case token = "access_token"
-    }
-    
-    #warning("This needs to be refactored, refresh token and other properties need to be available")
-    public init(credential: OAuthSwiftCredential) {
-        self.token = credential.oauthToken
-    }
-}