ESP OLED lazyness

So I’ve been trying to add MQTT subscription to this project

https://github.com/squix78/esp8266-weather-station/tree/master/examples/WeatherStationDemoExtendedDST

to replace the Thingspeak items, to be MQTT data from my HASS (temp and humidity from another ESP)

This project seemed easy, until i looked and then saw 4 files that make up the project !
any one bored and fancy helping me through ?