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/actions.go

@@ -27,9 +27,7 @@ func (a *application) workflowCommand() *cobra.Command {
 	group := &cobra.Command{
 		Use:   "workflow",
 		Short: "View, run, enable and disable Actions workflows",
-		Long: `View the Actions workflows of a repository, dispatch them, and enable or disable them.
-
-List and inspect the runs of workflows with tea run.`,
+		Long:  "Work with the Actions workflows of a repository. Inspect their runs with tea run.",
 	}
 	group.AddCommand(a.workflowListCommand(), a.workflowViewCommand(), a.workflowRunCommand(), a.workflowStateCommand(true), a.workflowStateCommand(false))
 	return group