Improve the site organization

[nannanli]

Zowe.org pages now has several page design issues.

• We added a Support page that talks about the Zowe Conformant Support Provider Program. However, when calling this page "Support", it might be confusing to visitors as users might be looking for community support information here such as the Slack channels and support for different components. This information is not available on this page now.
• Getting Zowe conformance badge is kind of a certification process. Can we create a separate Certification page to talk about the Zowe Conformance Program and the Zowe Conformant Support Provider Program? Looking at other open source projects such as Node or Kubernetes, a Training and Certification usually contains such information.

Therefore, we should reconsider the site navigation and organization to better organize the page content.