README.md: removing stale dataset references from metadata

Removed the following datasets from the metadata yaml, as they were generating errors on the model card. The datasets no longer appear available via hf.co:
- teknium1/GPTeacher/roleplay-instruct-v2-final
- teknium1/GPTeacher/codegen-isntruct
- project-baize/baize-chatbot/medical_chat_data
- project-baize/baize-chatbot/quora_chat_data
- project-baize/baize-chatbot/stackoverflow_chat_data

README.md

@@ -4,13 +4,8 @@ datasets:
 - camel-ai/code
 - ehartford/wizard_vicuna_70k_unfiltered
 - anon8231489123/ShareGPT_Vicuna_unfiltered
-- teknium1/GPTeacher/roleplay-instruct-v2-final
-- teknium1/GPTeacher/codegen-isntruct
 - timdettmers/openassistant-guanaco
 - camel-ai/math
-- project-baize/baize-chatbot/medical_chat_data
-- project-baize/baize-chatbot/quora_chat_data
-- project-baize/baize-chatbot/stackoverflow_chat_data
 - camel-ai/biology
 - camel-ai/chemistry
 - camel-ai/ai_society