Remove "mixtral" from tags.

The model is wrongly depicted as a "mixture of experts" model in the [open LLM leaderbord](https://huggingface.co/spaces/open-llm-leaderboard/open_llm_leaderboard#/?params=7%2C69&columns=rank%2Cmodel.type_icon%2Cid%2Cmodel.average_score%2Cevaluations.ifeval.normalized_score%2Cevaluations.bbh.normalized_score%2Cevaluations.math.normalized_score%2Cevaluations.gpqa.normalized_score%2Cevaluations.musr.normalized_score%2Cevaluations.mmlu_pro.normalized_score%2Cmetadata.params_billions%2Cfeatures.is_moe%2Cmetadata.generation&filters=is_merged). You claim the model is based on 01-ai/Yi-1.5-34B-32K, so add it.

README.md

@@ -1,21 +1,21 @@
----
-license: apache-2.0
-language:
-- zh
-- en
-- fr
-- de
-- ja
-- ko
-- it
-- ru
-- fi
-pipeline_tag: text-generation
-inference: false
-library_name: transformers
-tags:
-- mixtral
----
+---
+license: apache-2.0
+language:
+- zh
+- en
+- fr
+- de
+- ja
+- ko
+- it
+- ru
+- fi
+pipeline_tag: text-generation
+inference: false
+library_name: transformers
+base_model:
+- 01-ai/Yi-1.5-34B-32K
+---
 
 
 # OpenBuddy - Open Multilingual Chatbot