Changed location of db and config to one unified directory, 'appdata'

Archive files now get generated if nonexistent during deletions

Simplified docker-compose.yml to not require environment variables. Added volume for appdata folder which will be automatically shipped with docker builds

backend/consts.js

@@ -1,5 +1,3 @@
-var config = require('config');
-
 let CONFIG_ITEMS = {
     // Host
     'ytdl_url': {