feat: ready to join link and fix layouts

Resolves part of https://gitlab.eclipse.org/eclipsefdn/infrazilla/-/issues/1876

• fix: add missing padding to card
• feat: update hubspot styles and add ready to join link
• fix: layout not fluid

content/membership/join-us/_index.md

@@ -2,6 +2,15 @@
 title: "Join Us"
 seo_title: "Join Eclipse IoT Working Group"
 keywords: ["join Eclipse IoT", "Eclipse IoT", "IoT solutions", "IoT architecture", "open source software", "working group"]
+container: "container-fluid iot-membership-container"
 ---
 
-{{< hubspot_contact_form portalId="5413615" formId="077c6711-0dc7-460e-b496-7d9a37cbc133" >}}
+Is your organisation ready to become a member? 
\ No newline at end of file
+**[Join now](https://membership.eclipse.org/application/ready-to-join)**.
+
+If you have questions about membership in this working group or would like some
+assistance with the application process, complete the form below.
+
+## Contact Us About Membership
+
+{{< hubspot_contact_form portalId="5413615" formId="077c6711-0dc7-460e-b496-7d9a37cbc133" >}}