Update NPM pkgs, Hugo to 0.157.0, drop cpy-cli

[chalin]

• Updates NPM packages
• Updates Hugo to 0.157.0
• Drops cpy-cli in favor of just a bash -c 'cp ...' call, since bash -c is used elsewhere in the build process and cpy v7 was causing problems.

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No change to generated site files other than image finger prints (and the site timestamp):

$ (cd public && git diff -bw --ignore-blank-lines -I 'meta name="generator" content="Hugo' -I '_hu_') | grep ^diff | grep -v \.jpg
diff --git a/fr/project/index.html b/fr/project/index.html
diff --git a/project/index.html b/project/index.html