docs: describe the gh-style output, aliases and flags in the 1.0 guide

Update the migration guide for the output on terminals and in pipes,
markdown and hyperlink preferences, verb aliases and gh short flags, -q
and -y, exit codes, the inbox default of notifications, config get, auth
status and token, pr checkout branch names, pr review types, comment
commands, name addressing, and setup-git replacing old helpers. Fix the
merge example, which now needs --yes, and the contributor guide's output
and layering notes.

Signed-off-by: bircni <bircni@icloud.com>

docs/example-workflows.md

@@ -21,7 +21,7 @@ a nonzero exit code.
 For an explicitly authorized merge in CI:
 
 ```sh
-tea pr merge 123 --repo owner/repository --method rebase --no-input
+tea pr merge 123 --repo owner/repository --rebase --yes --no-input
 ```
 
 Keep credentials in the secret environment or credential store. Never write a token