Refactor _chromadb.py to improve code structure and readability

_chromadb.py

@@ -7,12 +7,15 @@ from chromadb.config import Settings
 from dotenv import load_dotenv
 from chromadb.utils import embedding_functions
 
-
 load_dotenv('.chroma_env')
+
 class ChromaDB:
-    def __init__(self):
+    def __init__(self, local_deployment: bool = False, db='sci_articles'):
+        if local_deployment:
+            self.db = chromadb.PersistentClient(f'chroma_{db}')
+        else:
             self.db = chromadb.HttpClient(
-            host="https://lasseedfast.se/chroma_ev_cars",
+                host=os.getenv('CHROMA_HOST'),
                 settings=Settings(
                     chroma_client_auth_provider="chromadb.auth.token_authn.TokenAuthClientProvider",
                     chroma_client_auth_credentials=os.getenv("CHROMA_CLIENT_AUTH_CREDENTIALS"),