"Dive into Hydra" Wiki Updates for Hyrax 2.x

[jrgriffiniii]

Working to address samvera/active_fedora#1317, I became aware that this Wiki is referenced in a number of standard community contributing guidelines documents.

Should the branding still remain "Hydra"? If so, are there any aspects of this tutorial which may have been deprecated by @mark-dce @bess @no-reply, or other community supporters at Data Curation Experts? (I ask this given that at least one member of the Core Component Maintenance WG had these concerns recently, particularly as they related to Hyrax 2.x releases).