Breakout store queries (#8)

- Break out store queries, so not locked into a Milvus/Cassandra backend
- Break out prompting into a separate module, so that prompts can be tailored to other LLMs
- Jsonnet used to generate docker compose templates
- Version to 0.6.0

templates/cassandra.jsonnet

@@ -0,0 +1,18 @@
+local base = import "base.jsonnet";
+local images = import "images.jsonnet";
+{
+    volumes +: {
+	cassandra: {},
+    },
+    services +: {
+	cassandra: base + {
+	    image: images.cassandra,
+	    ports: [
+		"9042:9042"
+	    ],
+	    volumes: [
+		"cassandra:/var/lib/cassandra"
+	    ],
+	}
+    },
+}