docs: shorten help and migration texts to gh-like brevity

Long texts no longer restate the flag list, the instance selection
of tea help environment, the config keys with descriptions or the
team argument rules shown under ARGUMENTS; webhook events come from
services.WebhookEvents; the migration guide refers to tea help
formatting for the terminal layout.

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

internal/app/action_runs.go

@@ -28,10 +28,7 @@ func (a *application) runCommand() *cobra.Command {
 	group := &cobra.Command{
 		Use:   "run",
 		Short: "View and manage Actions workflow runs",
-		Long: `List, view and watch the runs of a repository's Actions workflows, read their logs, download
-their artifacts, and cancel, rerun or delete them.
-
-Start a run with tea workflow run.`,
+		Long:  "Work with the runs of a repository's Actions workflows. Start a run with tea workflow run.",
 	}
 	group.AddCommand(a.runListCommand(), a.runViewCommand(), a.runWatchCommand(), a.runCancelCommand(), a.runRerunCommand(), a.runDeleteCommand(),
 		a.runJobsCommand(), a.runLogsCommand(), a.runDownloadCommand(), a.artifactCommand())