Move cncd/pipeline/pipeline/ to pipeline/ (#347)

* Refactor: move cncd/pipeline/ to pipeline/

* Refactor: move pipeline/pipeline/ to pipeline/

pipeline/samples/sample_8_postgres/pipeline.yml

@@ -0,0 +1,17 @@
+pipeline:
+  ping:
+    image: postgres
+    commands:
+      - sleep 10
+      - psql -U postgres -d test -h database -p 5432 -c "CREATE TABLE person( NAME TEXT );"
+      - psql -U postgres -d test -h database -p 5432 -c "INSERT INTO person VALUES('john smith');"
+      - psql -U postgres -d test -h database -p 5432 -c "INSERT INTO person VALUES('jane doe');"
+      - psql -U postgres -d test -h database -p 5432 -c "SELECT * FROM person;"
+
+services:
+  database:
+    image: postgres
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_DB=test
+