Anatomy - More consistent style, more clarity, apply diataxis tutorial principles

[mfisher87]

Added "You should notice..." callouts throughout

Removed/condensed unnecessary text

Fleshed out learning objectives (maybe these should be removed entirely in favor of outcomes?)

You -> we language

Removed comment about SSH setup (sorry @ktaletsk! The current instructions set up token auth, so users don't actually have to input their username and password)

Add placeholder time estimates for each exercise

Simplify outcomes

Other wording / clarity tweaks

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https://diataxis.fr/tutorials/#tutorials

• Show the learner where they’ll be going
• Deliver visible results early and often
• Maintain a narrative of the expected
• Point out what the learner should notice
• Target the feeling of doing
• Encourage and permit repetition
• Ruthlessly minimise explanation
• … and focus on the concrete
• Ignore options and alternatives
• Aspire to perfect reliability

I don't think we're there on all of these, I'd like your feedback on how we can get closer :)

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