Simplified example [skip ci]

Author: ankane

examples/cohere/src/main/java/com/example/Example.java

@@ -19,7 +19,6 @@
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.pgvector.PGbit;
-import com.pgvector.PGvector;
 
 public class Example {
     public static void main(String[] args) throws IOException, InterruptedException, SQLException {
@@ -35,8 +34,6 @@ public static void main(String[] args) throws IOException, InterruptedException,
         setupStmt.executeUpdate("CREATE EXTENSION IF NOT EXISTS vector");
         setupStmt.executeUpdate("DROP TABLE IF EXISTS documents");
 
-        PGvector.addVectorType(conn);
-
         Statement createStmt = conn.createStatement();
         createStmt.executeUpdate("CREATE TABLE documents (id bigserial PRIMARY KEY, content text, embedding bit(1024))");