Add Civo to the create cluster page

What does this MR do and why?

This MR adds Civo logo to the create cluster page. The logo is linked to the documentation page.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Visit Infrastructure -> Kubernetes clusters page
2. Select Create a cluster from the actions dropdown
3. Verify the page

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Review progress:

• UX review
• frontend developer review
• frontend maintainer review

Related to #363616 (closed)

app/views/clusters/clusters/cloud_providers/_cloud_provider_button.html.haml

@@ -2,11 +2,11 @@
 - help_path = local_assigns.fetch(:help_path)
 - label = local_assigns.fetch(:label)
 - last = local_assigns.fetch(:last, false)
-- classes = ["btn btn-confirm gl-button btn-confirm-secondary gl-flex-direction-column gl-w-30p"]
+- classes = ["btn btn-confirm gl-button btn-confirm-secondary gl-flex-direction-column gl-flex-basis-0 gl-flex-grow-1 gl-min-w-0"]
 - conditional_classes = [("gl-mr-5" unless last)]
 
 = link_to help_path, class: classes + conditional_classes do
   %span.gl-display-flex.gl-align-items-center.gl-m-3.gl-h-64
-    = image_tag logo_path, alt: label, class: "gl-max-h-full gl-w-full"
+    = image_tag logo_path, alt: label, class: "gl-w-15 gl-max-h-full gl-max-w-full"
   %span.gl-white-space-normal
     = label