Documentation Improvements (#4894)

* Improvements for version banner

- Display at the bottom of the page
- Simplify text

* Use mkdocs version provider

* use 'navigation.instant'

* Support modern mkdocs features

- Much better navigation and improved features

* Content changes

* Add code to find previous versions

* Remove modern python syntax

* display output codes

* Hide version banner

* Extra debug message

* update terminology.md

docs/.gitignore

@@ -12,5 +12,6 @@ site/
 
 # Temp files
 releases.json
+versions.json
 
 .vscode/