Add Alex to lint documentation (#7852)

* Add Alex to lint documentation

* Attempt to trigger GitHub Action

* Configure Alex and update docs

* More docs updates

.github/workflows/lint.yml

@@ -0,0 +1,13 @@
+name: Lint
+
+on: [push]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Install
+        run: yarn --no-progress --non-interactive --no-lockfile
+      - name: Alex
+        run: yarn alex