[docs][glossary] Add page that lists all standardized k8s terms (#5657)

* Add comprehensive glossary page

Additional Authors:
* Andrew Chen <chenopis@users.noreply.github.com>
* Steve Perry <steveperry-53@users.noreply.github.com>

* incorporate Tim's feedback

* address zach's comments

* address more comments

* add additional crosslinking

* Add platform developer, tweak formatting for disambiguation cases or multiparagraph definitions.

_data/glossary/code-contributor.yaml

@@ -0,0 +1,11 @@
+id: code-contributor
+name: Code Contributor
+aka:
+  - Community Developer
+tags:
+- community
+- user-type
+short-description: |
+  A person who develops and contributes code to the Kubernetes open source codebase.
+long-description: |
+  They are also an active [community member](#term-community-member) who participates in one or more [Special Interest Groups (SIGs)](#term-sig).