Merge pull request #3952 from camilamacedo86/prepare-docs-release

📖 Prepare docs for 4x release

CONTRIBUTING.md

@@ -172,7 +172,6 @@ The docs are published off of three branches:
 
 - `book-v4`: [book.kubebuilder.io](https://book.kubebuilder.io) -- current docs
 - `book-v3`: [book-v3.book.kubebuilder.io](https://book-v3.book.kubebuilder.io) -- legacy docs
-> The above one is not working. We have been looking forward to sort it out, see: https://github.com/kubernetes-sigs/kubebuilder/issues/3931. However, you can check the content under the `docs/` dir of the branch book-v3.
 - `book-v2`: [book-v2.book.kubebuilder.io](https://book-v2.book.kubebuilder.io) -- legacy docs
 - `book-v1`: [book-v1.book.kubebuilder.io](https://book-v1.book.kubebuilder.io) -- legacy docs
 - `master`: [master.book.kubebuilder.io](https://master.book.kubebuilder.io) -- "nightly" docs

docs/book/src/introduction.md

@@ -1,6 +1,7 @@
 **Note:** Impatient readers may head straight to [Quick Start](quick-start.md).
 
-**Using Kubebuilder v1 or v2? Check the legacy documentation for [v1](https://book-v1.book.kubebuilder.io) or [v2](https://book-v2.book.kubebuilder.io)**
+**Using previous version of Kubebuilder v1 or v2?**
+**Check the legacy documentation for [v1](https://book-v1.book.kubebuilder.io), [v2](https://book-v2.book.kubebuilder.io) or [v3](https://book-v2.book.kubebuilder.io)**
 
 ## Who is this for
 

docs/book/theme/index.hbs

@@ -132,7 +132,8 @@
                             <i class="fa fa-book"></i>
                             </button>
                             <div class="version-dropdown-content">
-                                <a href="https://book.kubebuilder.io/"target="_blank" rel="noopener noreferrer">v3-book</a>
+                                <a href="https://book.kubebuilder.io/"target="_blank" rel="noopener noreferrer">latest (v4-book)</a>
+                                <a href="https://book-v3.kubebuilder.io/"target="_blank" rel="noopener noreferrer">v3-book</a>
                                 <a href="https://book-v2.book.kubebuilder.io/"target="_blank" rel="noopener noreferrer">v2-book</a>
                                 <a href="https://book-v1.book.kubebuilder.io/"target="_blank" rel="noopener noreferrer">v1-book</a>
                             </div>