Convert site to Hugo (#8316)

This commit converts content and layout to use Hugo.

content/en/docs/reference/glossary/cla.md

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+---
+title: CLA (Contributor License Agreement)
+id: cla
+date: 2018-04-12
+full_link: https://github.com/kubernetes/community/blob/master/CLA.md
+short_description: >
+  Terms under which a contributor grants a license to an open source project for their contributions.
+
+aka: 
+tags:
+- community
+---
+ Terms under which a {{< glossary_tooltip text="contributor" term_id="contributor" >}} grants a license to an open source project for their contributions.
+
+<!--more--> 
+
+CLAs help resolve legal disputes involving contributed material and intellectual property (IP).
+