* updates to variablesand subscription
previous notebook was not taking Subscription into account. Here, I'm setting to use the az context explicitly with the $Subscription variable
* Converted appendix to nb, wording
* remove whitespace, add clarity
* Added azurehybridtoolkit to list of external extensions
* Added updated book
* added to recommended extensions
* extensions.js updated for build
* added small changes to extension
* small changes to extension
* tsconfig change
* gitignore and vscode changes
* changed package display name