Revert "docs: building Grafana on arm."
Revert "docs: building Grafana on arm."

Further work-arounds are needed to make this work.
This reverts commit 8a2de587284d9cf3e50938e35e6604ec4febf16f.

grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana