docs: update links to openmetrics to reference the v1.0.0 release

[dashpole]

Related to prometheus/OpenMetrics#287

The OM 2.0 effort is kicked off, and will start developing on main. This updates the links to OpenMetrics to reference the 1.0 release. The OM project has also been moved into the prometheus github org.

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[mrueg]

thanks!
/lgtm

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