Update docs step

.drone.yml

@@ -9,11 +9,6 @@ steps:
     commands:
       - cd scripts
       - find -name "*.sh" | xargs shellcheck
-  - name: markdownlint
-    image: markdownlint/markdownlint
-    commands:
-      - cd docs
-      - find -name "*.md" | xargs mdl
   - name: docs
     image: michaelfbryan/mdbook-docker-image
     volumes:
@@ -22,8 +17,6 @@ steps:
     commands:
       - cd docs
       - mdbook build
-    depends_on:
-      - markdownlint
   - name: rebuild-cache
     image: drillster/drone-volume-cache
     volumes: