Simplify Travis file

Author: dunglas

.travis.yml

@@ -4,28 +4,26 @@ node_js:
 
 cache:
   yarn: true
+  directories:
+    - $HOME/.cache/pip
 
 env:
   global:
     secure: gjiWHIgNjLXuEFmLiepiOTHOuauHfeKHutrE0sBwFZUQzP9FoGTZzJub1z8/vm+hhygA+TZbB0iclygHyNrXCkZyNdnZXChXl4iPdYqY3OARPOAbQff16+/XSUDsZ/Ok1etdb3kKor1R4rBt/WywBvXmmdggumTA3yT5ExI+dyomdONo4yMUZ7g1la0ehMEzGqyVjt0nUW31PN3l6dI1qgigHCuotSrrpWP6fTXuUh5l6YA7KXb/V1hJxaGENLz1Cdfk0sF66e4KsV/DX6JZSqpvdqVB8OTPU+si511yJtGS8OeuLs4RqmXMLrY/ChCodlYnfCE+NleBFpUnCVqth/RDRh7LvplUJlpsXNcfyoA3mOFmZa0euOMCqJ3qwESz802Y9c5oN63hn2OUF/raFDc3SMMC86FFHxwyYjz5+yzXYupnFNj39NKdQ1v1KBbY8BD8UT8RU3mlu4/3LRz0tSamREHj3pGgBmvgUZfUE1dMngeaZjOmBaIZH8TnKQ75CvfnoT+LJnZo6g9g4uwz6jtaIziSMZ0OW/95nF8yx+xONbHEtt5ex5M09NOFsN2vB2bcUAgIjyGrmmNLQadwJyQv557IGPEE5CyGhJpXh9XZ+WMw2vO45MOw4sQPkARF6OJkMteqFc2NLXMOQJ07EScbgEKR/9VOcyxIk/7a7nc=
 
-before_install:
-  - curl -o- -L https://yarnpkg.com/install.sh | bash
-  - export PATH="$HOME/.yarn/bin:$PATH"
-
 install:
-  - pip install --user proselint
+  - pip install --quiet --user proselint
   - cp .proselintrc ~
   - cd ..
-  - git clone https://github.com/api-platform/website.git
+  - git clone --depth 1 https://github.com/api-platform/website.git
   - cd website
-  - yarn install
+  - yarn install --silent
   - ln -s $TRAVIS_BUILD_DIR src/pages/docs
   - cd $TRAVIS_BUILD_DIR
 
 script:
-  - find . -name '*.md' ! -name 'conduct.md' ! -name 'heroku.md' -exec proselint {} \;
-  - cd $TRAVIS_BUILD_DIR/../website
+  - find . -name '*.md' -exec proselint {} \;
+  - cd ../website
   - bin/generate-nav
   - GATSBY_BRANCH_NAME=$TRAVIS_BRANCH yarn gatsby build
   # Preserve artifacts