docs: sync generated CLI reference

[medriscoll]

Summary

• remove generated pages for retired rill env configure and rill usergroup rename commands
• remove obsolete example-project text from rill init reference

Validation

• built the current Rill source CLI
• verified the official v0.88.6 arm64 archive checksum
• exercised all 105 current reference command paths with --help against v0.88.6
• ran isolated rill init, rill validate --pull-env=false, rill start, and rill query --local workflows
• ran npm ci and npm run build in docs/ successfully

[nishantmonu51]

The two stale page deletions are correct: neither configure nor rename exists under cli/cmd/env/ or cli/cmd/usergroup/ on main.

[nishantmonu51]

This hunk was not produced by make docs.generate, so docs-check fails on it. make docs.generate depends on runtime.examples.embed (Makefile:33, Makefile:63), which copies the KEEP_EXAMPLES projects into runtime/pkg/examples/embed/dist before running the generator; examples.List() then populates this block from cli/cmd/initialize/init.go:26. The generator also always emits the trailing blank line removed at the end of the file (cli/cmd/docs/generate_cli.go:173). CI regenerates both and fails with "Generated docs are out of date". Dropping this hunk and keeping only the two page deletions is enough.