Removed unnecessary files

contracts/Migrations.sol

@@ -1,19 +0,0 @@
-// SPDX-License-Identifier: MIT
-pragma solidity >=0.4.22 <0.8.0;
-
-contract Migrations {
-  address public owner = msg.sender;
-  uint public last_completed_migration;
-
-  modifier restricted() {
-    require(
-      msg.sender == owner,
-      "This function is restricted to the contract's owner"
-    );
-    _;
-  }
-
-  function setCompleted(uint completed) public restricted {
-    last_completed_migration = completed;
-  }
-}

migrations/1_initial_migration.js

@@ -1,5 +0,0 @@
-const Migrations = artifacts.require("Migrations");
-
-module.exports = function (deployer) {
-  deployer.deploy(Migrations);
-};