[landscape.io] Deprecating .landscape.yml (#4563)

.landscape.yml

@@ -1,22 +0,0 @@
-doc-warnings: yes
-test-warnings: no
-strictness: medium
-max-line-length: 90
-uses:
-    - flask
-autodetect: yes
-pylint:
-  disable:
-    - cyclic-import
-    - invalid-name
-    - logging-format-interpolation
-  options:
-    docstring-min-length: 10
-pep8:
-  full: true
-ignore-paths:
-    - docs
-    - superset/migrations/env.py
-ignore-patterns:
-    - ^example/doc_.*\.py$
-    - (^|/)docs(/|$)