README: concise version with physical quantities, repo name phi4-generative

#1
phi4-generative org

Removes the paragraph on the earlier 2D chains, trims the text to the essentials, adds <phi^2>, /V and xi_2/L to the tables, and points all download commands to phi4-generative/phi4-critical-configs.

YangyangTan changed pull request status to merged

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