Site maintenance etc.

[jdolitsky]

• Move site build logic into ./hack/build-static-site.sh
• Update Go modules
• Update Ruby gems
• Remove the strange topbar issue mentioned in Slack

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[jdolitsky]

@sudo-bmitch - I converted your two comments into issues:

• https://github.com/opencontainers/oci-conformance/issues/116
• https://github.com/opencontainers/oci-conformance/issues/117

Will go ahead and merge this since it gets us into a better spot