Merge branch 'tweaks' into 'master'

Four small tweaks

See merge request pages/mkdocs!11

.gitignore

+public

.gitlab-ci.yml

 image: python:3.8-buster
 
 before_script:
-  - pip install mkdocs
-  # Add your custom theme if not inside a theme_dir
-  # (https://github.com/mkdocs/mkdocs/wiki/MkDocs-Themes)
-  # - pip install mkdocs-material
+  - pip install -r requirements.txt
+
+test:
+  stage: test
+  script:
+  - mkdocs build --strict --verbose --site-dir test
+  artifacts:
+    paths:
+    - test
+  except:
+  - master
 
 pages:
+  stage: deploy
   script:
-  - mkdocs build
-  - mv site public
+  - mkdocs build --strict --verbose
   artifacts:
     paths:
     - public

mkdocs.yml

 site_name: My Docs by GitLab Pages
 site_url: https://pages.gitlab.io/mkdocs
+site_dir: public

requirements.txt

+# Documentation static site generator & deployment tool
+mkdocs>=1.1.2
+
+# Add your custom theme if not inside a theme_dir
+# (https://github.com/mkdocs/mkdocs/wiki/MkDocs-Themes)
+#  mkdocs-material>=5.4.0