add step to verify docs on area/documentation PRs (#1528)

* add step to verify docs on area/documentation PRs

* use GH actions to run the verification

* add check if label is set to area/documentation

* fix broken links in docs with WIP files

* add generating API docs before verifying

Signed-off-by: Sebastian Malton <sebastian@malton.name>

docs/extensions/README.md

@@ -14,7 +14,7 @@ Here are some examples of what you can achieve with the Extension API:
 
 * Add custom components & views in the UI - Extending the Lens Workbench
 
-For an overview of the Lens Extension API, refer to the [Common Capabilities](capabilities/common-capabilities.md) page. [Extension Guides Overview](guides/overview.md) also includes a list of code samples and guides that illustrate various ways of using the Lens Extension API.
+For an overview of the Lens Extension API, refer to the [Common Capabilities](capabilities/common-capabilities.md) page. [Extension Guides Overview](guides/README.md) also includes a list of code samples and guides that illustrate various ways of using the Lens Extension API.
 
 ## How to Build Extensions
 

docs/extensions/guides/anatomy.md

@@ -0,0 +1,3 @@
+---
+WIP
+---

docs/extensions/guides/components.md

@@ -0,0 +1,3 @@
+---
+WIP
+---

docs/extensions/guides/kube-object-list-layout.md

@@ -0,0 +1,3 @@
+---
+WIP
+---

docs/extensions/guides/stores.md

@@ -0,0 +1,3 @@
+---
+WIP
+---