Remove `sentence-transformers` tags

Hello!

## Pull Request overview
* Remove `sentence-transformers` tags

## Details
These tags are meant to be used with models that work out of the box with Sentence Transformers, i.e. that have the required configuration files such that the following works:
```python
from sentence_transformers import SentenceTransformer

model = SentenceTransformer("model_author/model_name")
embeddings = model.encode(["This is some arbitrary text"])
```

- Tom Aarsen

README.md

@@ -1,9 +1,7 @@
 ---
 tags:
 - mteb
-- Sentence Transformers
 - sentence-similarity
-- sentence-transformers
 model-index:
 - name: e5-base-4k
   results: