get rid of porg dependency, use orgparse directly

tests/orgmode.py

@@ -1,7 +1,7 @@
 from my import orgmode
-
+from my.core.orgmode import collect
 
 def test() -> None:
     # meh
-    results = list(orgmode.query().query_all(lambda x: x.with_tag('python')))
+    results = list(orgmode.query().collect_all(lambda n: [n] if 'python' in n.tags else []))
     assert len(results) > 5