[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/contributor.yaml

@@ -0,0 +1,8 @@
+id: contributor
+name: Contributor
+tags:
+- community
+short-description: |
+  Someone who donates code, documentation, or their time to help the Kubernetes project or community.
+long-description: |
+  Contributions include pull requests (PRs), issues, feedback, [special interest group (SIG)](#term-sig) participation, or organizing community events.