Update docs to v2 (#278)

* Update docs to v2

* Bump checkout action to v3

* Update installer scripts

* Replace v2 to vX on the docs, minor fixes

* Remove extra whitespace

.github/workflows/licensed.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Check licenses
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - run: npm ci
       - name: Install licensed
         run: |