Update handling data articles

content/guides/handling_data/_index.md

content/guides/handling_data/data_for_unmc_users_only.md

content/guides/handling_data/high_speed_data_transfers.md

content/guides/handling_data/integrating_box_with_hcc.md

content/guides/handling_data/preventing_file_loss.md

content/guides/handling_data/using_attic.md

content/guides/handling_data/using_the_common_file_system.md

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static/images/box_create_external_password.png