Incorporate unit economics playbook content into capability

[andrewnhem]

• Reworked relevant Playbook content into Capability sections
• Added references to playbook and Cloud FinOps book

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[vnm-fodo]

nice job integrating the WG deliverable back into the Capability content 👍

suggestions:

• for the "Definition" section, add some plain language back in to kickstart the definition; for example:

Fundamentally, this Capability is about developing metrics that reveal the business value of your cloud spend. By calculating cloud spend for total revenue, you can attach growth in cloud spending to your overall business growth. When these are in line, it makes sense that cloud spend isn’t wasted. When cloud spend is growing faster than the business, there may be cause for concern. For a customer-facing application, that unit might be a user or customer subscription; for an ecommerce platform, it might be a transaction; and for an airline, it might be a seat.

When practitioners address measuring unit costs, it’s often in ...

• merge the "Do what’s right for your organization" into the "Functional Activity" section as a sub_section to dovetail into the Personas being listed

• for the "Functional Activity" section, consolidate the existing activities that are already listed into the awesome new table by persona (ie) versus having 2 separate sections (feels a bit disjointed)

everything else looks great to /me.

shipit