Remove config.json

Remove config.json (not secure) and replace with .env.

Update deploy-commands.js:
- const { token, clientId } = require('./config.json');
+ const { token, clientId } = process.env;

Update index.js:
- const { token, clientId } = require('./config.json');
+ const token = process.env.TOKEN;

.env

@@ -0,0 +1,2 @@
+TOKEN=MTQwNzE2NDE4NDM3Mzg4NzAzOA.GTKr90.U2ootmaOWuycn4ZqbE4kqSpQqeVGvw7Zj5vHgM
+CLIENT_ID=1407164184373887038