Replaced semantic class names with utility class names

css/facilities/clinic.css

css/facilities/facilities.css

css/facilities/farmyard.css

css/facilities/pit.css

css/facilities/spa.css

src/facilities/clinic/clinic.js

src/facilities/farmyard/farmyard.js

src/facilities/pit/pit.js

src/facilities/spa/spa.js

src/npc/interaction/killSlave.js