feat: How to use GitHub Codespaces to simplify your Quarto workshops (#1667)

* feat: Codespaces and Quarto CLI: A Perfect Partnership for Workshops, Teaching, and Development

* style: use inline code markup

* fix: add link to Codespaces feature page

* refactor: @cscheid edits + few minor ones

* style: lightbox and center Codespaces button

* fix: typo

* fix: remove content not really relevant

* fix: add code for Codespaces deep link as suggested by @coatless

* refactor: use image workflow first, then customise and show postStartCommand

* chore: add disclaimer

* chore: minor wording changes

* fix: change cross-ref and add paragraph break

* fix: add acknowledgments

* fix: ackowlegment as appendix

* fix: use full names

* chore: bump date to 19th of may

Author: mcanouil