feat: update doc links for kafka documentation to reflect migration to canonical.com

Author: nbellol

secondary-navigation.yaml

@@ -99,7 +99,7 @@ kafka:
     - title: Support
       path: /data/kafka/support
     - title: Docs
-      path: https://documentation.ubuntu.com/charmed-kafka/3
+      path: https://canonical.com/data/kafka/docs
 
 ceph:
   title: Ceph

templates/data/kafka/index.html

@@ -46,7 +46,7 @@
       <a class="p-button--positive js-invoke-modal"
          aria-controls="data-kafka-modal"
          href="/contact-us">Get in touch</a>
-      <a href="https://documentation.ubuntu.com/charmed-kafka/3" class="p-button">Get started</a>
+      <a href="https://canonical.com/data/kafka/docs" class="p-button">Get started</a>
     {%- endif -%}
   {%- endcall -%}
 
@@ -173,7 +173,7 @@
           "link": {
             "content_html": "Get started with Charmed Kafka&nbsp;&rsaquo;",
             "attrs": {
-              "href": "https://documentation.ubuntu.com/charmed-kafka/3"
+              "href": "https://canonical.com/data/kafka/docs"
             }
           }
         }
@@ -407,7 +407,7 @@ <h3 class="p-heading--5">Data hub integration</h3>
                     "type": "html",
                     "content": '
                     <h3 class="p-heading--5 u-no-margin--bottom">
-                      <a href="https://documentation.ubuntu.com/charmed-kafka/3/h-deploy-anywhere">Read the documentation</a>
+                      <a href="https://canonical.com/data/kafka/docs/4/how-to/deploy/deploy-anywhere/">Read the documentation</a>
                     </h3>
                     <p>Read the Installation guide to learn how to get started with Charmed Kafka, on cloud VMs or on Kubernetes.</p>
                     '

templates/data/kafka/what-is-kafka.html

@@ -391,7 +391,7 @@ <h2>Installing Kafka</h2>
           You can use Charmed Apache Kafka to deploy a fully supported Kafka service on cloud servers, Kubernetes, or even on your laptop.
         </p>
         <div class="p-cta-block u-no-padding--bottom">
-          <a class="p-button--positive" href="https://documentation.ubuntu.com/charmed-kafka/3">Try Charmed Kafka</a>
+          <a class="p-button--positive" href="https://canonical.com/data/kafka/docs">Try Charmed Kafka</a>
         </div>
       </div>
     </div>