fix: add ng update Angular and Material instructions to v16

[ejuelSentry]

closes #219 since prior contributor never finished the work.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[ejuelSentry]

@mgechev I see you worked on the last PR for Angular V16 instructions (#218), mind taking a look at my PR?

Much appreciated.

[ejuelSentry]

Looks like all the Angular devs at Google that can approve PRs are on a 1+ month vacation.

[dmoore1181]

Is there any update on when this will be merged? I know that the steps are repetitive from other upgrades, but someone who hasn't upgraded before won't know that and it just causes unnecessary confusion otherwise.

[ejuelSentry]

@dmoore1181 - I feel for you. Unfortunately I'm stuck waiting for someone with permissions to approve the PR, and everyone I've tagged has not responded.

@mgechev any chance you've had time to look at this PR?