Examples need to be updated, cortex-m-quickstart repo has been deprecated by author

[krakpot]

It looks like the author of cortex-m-quickstart removed all contents on 2025-07-29 (see commit) and the repo has been archived.

README.md has been updated with the following info:

cortex-m-quickstart

This repository previously contained a template for building applications for ARM Cortex-M microcontrollers, but it has been deprecated and is no longer maintained. The previous version can be seen in the git history.

Instead, we suggest using [app-template](https://github.com/knurling-rs/app-template), or the getting started guide for whatever framework or HAL you are interested in using.

This causes the examples not to work as is as the repository only contains the README.md if one does not manually check out the revision before the deprecation.

The author suggests using app-template instead. I'm currently learning Rust myself (coming from ~18yrs of embedded C) , but I'm not far along in Rust or the tooling to be able to make a PR with correctly updated examples for this yet.

[BartMassey]

Yes, that decision was made by Embedded WG. If you want to do a PR it will be welcome, otherwise I'll try to remember to fix it myself once we have done a couple of other things with the book.