stack: Typ project und Collection kb/gtd/ (#123)

Files changed:
- CHANGES.md
- README.md
- VERSION
- kb/CONTRACT.md
- kb/CONVENTIONS.md
- kb/entities/COLLECTION.md
- kb/gtd/COLLECTION.md
- kb/gtd/INDEX.md
- kb/index.md
- tools/CONTRACT.md
- tools/chemenu/kb_collections.py
- tools/chemenu/tests/test_conventions.py
- tools/chemenu/tests/test_docs_verify.py
- tools/chemenu/tests/test_kb_collections.py
- tools/chemenu/tests/test_new_page.py
- tools/chemenu/tests/test_type_resolver.py
- tools/chemenu/tests/test_types_cmd.py
- types/project.md
- types/project.schema.yaml
- types/type-spec.md

kb/entities/COLLECTION.md

@@ -5,6 +5,7 @@ outbound:
   concepts: [implements, exemplifies, rests-on, applies-when, operates-on, invokes, authored, alternative-to, see-also]
   sources: [evidenced-by, defined-in, see-also]
   comparisons: [compares-with, see-also]
+  gtd: [see-also]
 required_by_stack: false
 ---