create tip installing_google_cloud_sdk_on_ubuntu_with_oh-my-zsh

created from first part of setting_up_a_minecraft_server_on_google_compute_engine
more work on setting_up_a_minecraft_server_on_google_compute_engine
draft of articles on intrduction to annotation processing
script_to_delete_all_objects_in_a_schema is a tip, not an article
add Tips page + latests tips on home page
rename TODO to TODO.md + add minecraft and tips todos
minecraft article is ready

need to fix completion in Google cloud SDK tip before going live