Added skeleton loading paradigm to UX guide

Dimitrie Hoekstra requested to merge skeleton-loading-paradigm into master

What does this MR do?

Adds skeleton loading paradigm to ux guide

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Paradigms need to be documented

Screenshots (if relevant)

See http://localhost:3000/help/development/ux_guide/

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?


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