This is the issue for tracking our plans for nudging users to transition away from using pep517 from the CLI. These changes would go into the inc-pep517.build branch and not the default branch.

• Revert Pull out high-level interfaces as an extended example #83 (see Revert "Pull out high-level interfaces as an extended example" #96)
• Point to python-build in the README
• {maybe} Point to python-build from issue templates
• Add a deprecation warning when pep517.build is used
• Add a deprecation warning when pep517.checkis used
• Release a version with the warning - possibly after a bit of a wait, to give people a chance to start moving to python-build and flush out any bugs there.

Originally posted by @takluyver in #83 (comment) and edited by @pradyunsg