Move original LTD Keeper application aside

- Keep the keeper/ directory since it won't conflict with the new
  codebase paths
- Move tests into keeper
- Drop manifests for kustomize
- Drop original Alembic migrations
- Drop some infrastructure files that won't be needed or will be
  substantially rebuilt

Author: jonathansick

.pre-commit-config.yaml

@@ -7,20 +7,3 @@ repos:
         args: [--allow-multiple-documents]
       - id: check-toml
       - id: check-json
-
-  - repo: https://github.com/PyCQA/isort
-    rev: 5.13.2
-    hooks:
-      - id: isort
-        additional_dependencies:
-          - toml
-
-  - repo: https://github.com/psf/black
-    rev: 22.3.0
-    hooks:
-      - id: black
-
-  - repo: https://github.com/pycqa/flake8
-    rev: 4.0.1
-    hooks:
-      - id: flake8