fix broken minikube link, only report broken links in GH action

.github/workflows/docs.yaml

@@ -42,6 +42,6 @@ jobs:
         id: lc
         uses: peter-evans/link-checker@v1
         with:
-          args: -v -d ./site -r ./site
+          args: -d ./site -r ./site
       - name: Fail if there were link errors
         run: exit ${{ steps.lc.outputs.exit_code }}

docs/contributing/get-started-developing.md

@@ -83,7 +83,7 @@ and run what we have locally.
     minikube delete
     ```
 
-4. The [`minikube` addon](https://github.com/kubernetes/minikube/blob/master/docs/addons.md)
+4. The [`minikube` addon](https://minikube.sigs.k8s.io/docs/commands/addons/)
    called [freshpod](https://github.com/GoogleCloudPlatform/freshpod)
    that will be very useful to us later. You'll see. It's gonna be cool.
 

docs/requirements.txt

@@ -1,4 +1,4 @@
 mkdocs                  == 1.1
-mkdocs-material         == 4.6.3
+mkdocs-material         == 5.1.0
 mkdocs-redirects
-pymdown-extensions      == 6.3.0
+pymdown-extensions      == 7.0.0