Update sample config to add minimal config for ledger, image search

sample_config.yml

@@ -5,7 +5,18 @@ content-type:
     compressed-jsonl: ".notes.json.gz"
     embeddings-file: ".note_embeddings.pt"
 
+  ledger:
+    compressed-jsonl: ".transactions.jsonl.gz"
+    embeddings-file: ".transaction_embeddings.pt"
+
+  image:
+    embeddings-file: '.image_embeddings.pt'
+
+
 search-type:
   asymmetric:
     encoder: "sentence-transformers/msmarco-MiniLM-L-6-v3"
     cross-encoder: "cross-encoder/ms-marco-MiniLM-L-6-v2"
+
+  image:
+    encoder: "clip-ViT-B-32"