chore: remove all deprecated commands

This change removes all deprecated commands. In many cases, users have been warned for a number of releases before the commands have been removed. All commands that were removed have existing alternatives.

tests/unit/10_apps.bats

@@ -11,10 +11,17 @@ teardown() {
 }
 
 @test "(apps) apps:help" {
+  run /bin/bash -c "dokku apps"
+  echo "output: $output"
+  echo "status: $status"
+  assert_output_contains "Manage apps"
+  help_output="$output"
+
   run /bin/bash -c "dokku apps:help"
   echo "output: $output"
   echo "status: $status"
   assert_output_contains "Manage apps"
+  assert_output "$help_output"
 }
 
 @test "(apps) apps:create" {