Revert "Add initial authentication system"

This reverts commit 1871ea9eb7.

server/db.js

@@ -1,52 +0,0 @@
-"use strict";
-const sqlite3 = require('sqlite3').verbose();
-
-class Db {
-    constructor(file) {
-        this.db = new sqlite3.Database(file);
-        this.createTable()
-    }
-
-    createTable() {
-        const sql = `
-            CREATE TABLE IF NOT EXISTS user (
-                id integer PRIMARY KEY,
-                name text,
-                email text UNIQUE,
-                user_pass text,
-                is_admin integer)`
-        return this.db.run(sql);
-    }
-
-    selectByEmail(email, callback) {
-        return this.db.get(
-            `SELECT * FROM user WHERE email = ?`,
-            [email], function (err, row) {
-                callback(err, row)
-            })
-    }
-
-    insertAdmin(user, callback) {
-        return this.db.run(
-            'INSERT INTO user (name,email,user_pass,is_admin) VALUES (?,?,?,?)',
-            user, (err) => {
-                callback(err)
-            })
-    }
-
-    selectAll(callback) {
-        return this.db.all(`SELECT * FROM user`, function (err, rows) {
-            callback(err, rows)
-        })
-    }
-
-    insert(user, callback) {
-        return this.db.run(
-            'INSERT INTO user (name,email,user_pass) VALUES (?,?,?)',
-            user, (err) => {
-                callback(err)
-            })
-    }
-}
-
-module.exports = Db