Change CO2 emissions metric from kg to g

Convert kg to g for co2_eq_emissions as per huggingface docs: https://huggingface.co/docs/hub/en/model-cards-co2

README.md

@@ -37,7 +37,7 @@ inference:
     length_penalty: 0.3
     early_stopping: true
 co2_eq_emissions:
-  emissions: 2.53
+  emissions: 2530
   source: CodeCarbon
   training_type: fine-tuning
   geographical_location: United States of America