.github: move codecov config into .github

.github/linter/markdownlint.yml

@@ -0,0 +1,8 @@
+default: true,
+MD007: { "indent": 4 }
+MD013: false
+MD024: { siblings_only: true }
+MD025: false
+MD033: { no-inline-html: false }
+no-hard-tabs: false
+whitespace: false

.github/workflows/linter.yml

@@ -27,6 +27,5 @@ jobs:
           DEFAULT_BRANCH: master
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           VALIDATE_MD: true
-          MARKDOWN_CONFIG_FILE: .markdownlint.yml
           VALIDATE_OPAENAPI: true
           VALIDATE_YAML: true