feat: update the Slack channel to point to the CNCF Slack

Also, the links on every blog post was updated

Signed-off-by: Jonathan Gonzalez V. <[email protected]>

Author: sxd

content/blog/running-postgresql-the-kubernetes-way/index.md

@@ -79,7 +79,7 @@ You can install it with `kubectl apply -f angus.yaml`, as with any other
 Kubernetes manifest.
 
 For more information, please refer to the [documentation for version 1.15.0](https://cloudnative-pg.io/docs/1.15.0/).
-Alternatively, reach out to us on [Slack](https://join.slack.com/t/cloudnativepg/shared_invite/zt-237bhehx3-htDW2kz2hKJxEhn1W4VTnw)
+Alternatively, reach out to us on [Slack](https://cloud-native.slack.com/archives/C08MAUJ7NPM)
 or use [GitHub discussions](https://github.com/cloudnative-pg/cloudnative-pg/discussions).
 
 If you are physically in Valencia for KubeCon Europe 2022, come and say hello to us!

layouts/partials/nav.html

@@ -41,7 +41,7 @@
           <a href="https://github.com/cloudnative-pg/cloudnative-pg">
             <img src="/icons/Git.svg" alt="Github">
           </a>
-          <a href="https://cloudnativepg.slack.com/">
+          <a href="https://cloud-native.slack.com/archives/C08MAUJ7NPM">
             <img src="/icons/Slack.svg" alt="Slack">
           </a>
           <a href="https://twitter.com/CloudNativePg">
@@ -58,7 +58,7 @@
         <a class="github-button" href="https://github.com/cloudnative-pg/cloudnative-pg"
           data-color-scheme="no-preference: light; light: light; dark: dark;" data-size="large" data-show-count="true"
           aria-label="Star cloudnative-pg/cloudnative-pg on GitHub">Star</a>
-        <a href="https://join.slack.com/t/cloudnativepg/shared_invite/zt-32c83whjr-L4poobu8NEVGGXqF_Mu5VA">
+        <a href="https://cloud-native.slack.com/archives/C08MAUJ7NPM">
           <img src="/icons/Slack.svg" alt="Slack" title="Join our Slack channel now!">
         </a>
         <a href="https://twitter.com/CloudNativePg">