[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/developer.yaml

@@ -0,0 +1,15 @@
+id: developer
+name: Developer (disambiguation)
+aka:
+  - Kubernetes Developer
+tags:
+- community
+- user-type
+short-description: |
+  May refer to: [*Application Developer*](#term-application-developer), [*Code Contributor*](#term-code-contributor), or [*Platform Developer*](#term-platform-developer).
+long-description: |
+  This overloaded term may have different meanings depending on the context. It could mean:
+
+  * [**Application Developer**](#term-application-developer): A person who writes an application that runs in a Kubernetes cluster.
+  * [**Code Contributor**](#term-code-contributor): A person who develops and contributes code to the Kubernetes open source codebase.
+  * [**Platform Developer**](#term-platform-developer): A person who customizes the Kubernetes platform to fit the needs of their project—for example, by extending the API.