websites: add probelab.io

[dennis-tra]

Changelog:

• Adds probelab.io to the list of monitored websites
• Adds probelab.io to the list of plot profiles
• Ran the website page generator which updated the copy on each websites' page.

Draft because we don't have probelab.io data yet. Good to merge a few days after this was merged: https://github.com/protocol/probelab-infra/pull/56

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