book: update refs to release specific books (#1288)

Signed-off-by: Prajyot-Parab <[email protected]>

Author: Prajyot-Parab

docs/book/book.toml

@@ -8,6 +8,7 @@ title = "Kubernetes Cluster API Provider IBM Cloud"
 [output.html]
 curly-quotes = true
 git-repository-url = "https://sigs.k8s.io/cluster-api-provider-ibmcloud"
+additional-css = ["theme/css/custom.css"]
 
 [preprocessor.tabulate]
 command = "mdbook-tabulate"

docs/book/src/introduction.md

@@ -16,6 +16,18 @@ hybrid deployments of Kubernetes.  It is built atop the lessons learned from
 previous cluster managers such as [kops](https://github.com/kubernetes/kops) and
 [kubicorn](http://kubicorn.io/).
 
+<aside class="note">
+
+<h1>Cluster API Provider IBM Cloud documentation versions</h1>
+
+This book documents Cluster API Provider IBM Cloud v0.5. For other versions please see the corresponding documentation:
+* [main.cluster-api-ibmcloud.sigs.k8s.io](https://main.cluster-api-ibmcloud.sigs.k8s.io)
+* [release-0-5.cluster-api-ibmcloud.sigs.k8s.io](https://release-0-5.cluster-api-ibmcloud.sigs.k8s.io/)
+* [release-0-4.cluster-api-ibmcloud.sigs.k8s.io](https://release-0-4.cluster-api-ibmcloud.sigs.k8s.io/)
+* [release-0-3.cluster-api-ibmcloud.sigs.k8s.io](https://release-0-3.cluster-api-ibmcloud.sigs.k8s.io/)
+
+</aside>
+
 ## CAPIBM Supported Infrastructure-as-a-Service (IaaS)
 
 <p align="center">

docs/book/theme/css/custom.css

@@ -0,0 +1,41 @@
+/* notes */
+aside.note {
+    border: 1px solid var(--searchbar-border-color);
+    border-radius: 3px;
+    margin-top: 1em;
+}
+
+aside.note > * {
+    margin-left: 1em;
+    margin-right: 1em;
+}
+
+/* note title */
+aside.note > h1 {
+    border-bottom: 1px solid var(--searchbar-border-color);
+    margin: 0;
+    padding: 0.5em 1em;
+    font-size: 100%;
+    font-weight: normal;
+    background: var(--quote-bg);
+}
+
+/* warning notes */
+aside.note.warning > h1 {
+    background: var(--warning-note-background-color, #fcf8f2);
+}
+aside.note.warning > h1::before {
+    /* TODO(directxman12): fill in these colors in theme.
+     * If you're good with colors, feel free to play around with this
+     * in dark mode. */
+    content: "!";
+    color: var(--warning-note-color, #f0ad4e);
+    margin-right: 1em;
+    font-size: 100%;
+    vertical-align: middle;
+    font-weight: bold;
+    padding-left: 0.6em;
+    padding-right: 0.6em;
+    border-radius: 50%;
+    border: 2px solid var(--warning-note-color, #f0ad4e);
+}