Aptana is a very heavy program.
I do not need Ruby/Python, how can I remove these plugins/addons to make it lighter for what I do?
Also how would I delete 'bundles' under the commands submenu?
It's not really possible to remove those items in the built application at the moment. There is some discussion about providing a very simple installer with one-click installs of extra languages, but we don't yet have an ETA on that. You can follow this ticket https://jira.appcelerator.org/browse/APSTUD-4583 for more information.