docs: Reorder install instructions in CONTRIBUTING.md (#17387)
docs: Reorder install instructions in CONTRIBUTING.md (#17387)


zhouyao1994/incubator-superset,airbnb/caravel,apache/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,apache/incubator-superset,zhouyao1994/incubator-superset,apache/incubator-superset,apache/incubator-superset,airbnb/caravel,apache/incubator-superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel