Replace mdl with markdownlint

`markdownlint` is based on `mdl`, has a broader set of rules and is
implemented with NodeJS instead of Ruby which makes it easier to install
`markdownlint` as a pre-commit hook.

Author: IngoMeyer441

.gitignore

@@ -2,7 +2,7 @@
 !.editorconfig
 !.gitignore
 !.gitlab-ci.yml
-!.mdl_style.rb
+!.markdownlint.yaml
 !.pre-commit-config.yaml
 *.pyc
 __pycache__/

.gitlab-ci.yml

@@ -8,9 +8,6 @@ pre-commit:
   stage: check
   image: python:3
   before_script:
-  - apt-get update
-  - apt-get install -y --no-install-recommends ruby
-  - gem install chef-utils -v 16.6.14
   - pip install pre-commit
   script:
   - pre-commit run --all-files || {

.markdownlint.yaml

@@ -0,0 +1,23 @@
+# Default state for all rules
+default: true
+
+# MD013/line-length - Line length
+MD013:
+  # Number of characters
+  line_length: 120
+  # Number of characters for headings
+  heading_line_length: 120
+  # Number of characters for code blocks
+  code_block_line_length: 120
+  # Include code blocks
+  code_blocks: true
+  # Include tables
+  tables: true
+  # Include headings
+  headings: true
+  # Include headings
+  headers: true
+  # Strict length checking
+  strict: false
+  # Stern length checking
+  stern: true

.pre-commit-config.yaml

@@ -42,11 +42,10 @@ repos:
       '--ignore=body-is-missing,title-must-not-contain-word',
       '--msg-filename'
     ]
-- repo: https://github.com/markdownlint/markdownlint
-  rev: v0.11.0
+- repo: https://github.com/igorshubovych/markdownlint-cli
+  rev: v0.27.1
   hooks:
   - id: markdownlint
-    args: ['--style=.mdl_style.rb']
 - repo: https://github.com/adrienverge/yamllint
   rev: v1.26.1
   hooks: