Pyroscope task doc

[mattdurham]

PR Description

This is largely a restructuring of https://grafana.com/docs/pyroscope/latest/configure-client/grafana-agent/go_pull/.

Which issue(s) this PR fixes

Fixes grafana/alloy#293

Notes to the Reviewer

PR Checklist

• [x] Documentation added

[clayton-cornell]

@mattdurham Media assets should be uploaded as described here: https://grafana.com/docs/writers-toolkit/write/image-guidelines/#where-to-store-media-assets

[mattdurham]

Now that I am back to working on this going to rewrite it more task oriented.

[knylander-grafana]

Should we consider removing the PYroscope content or sharing this updated doc back with the Pyroscope doc?

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[knylander-grafana]

@thampiotr There has been a bunch of work on the Pyroscope doc you started with: https://github.com/grafana/pyroscope/blob/main/docs/sources/configure-client/grafana-agent/go_pull.md

Should we see about merging your changes back into the Pyroscope doc and then sharing the content from Pyroscope to Alloy?