Remove Monitor document

[flodolo]

I assume this document will become unused once we push out the changes to the Subscription Services PN and ToS.
https://github.com/mozilla/legal-docs/blob/main/en/firefox_monitor_terms_privacy.md

Currently it's available here, linked from the Mozilla Subscription Services Privacy Notice.

@mafeld
Should this be removed from the repository after February 6?

@pmac
Does it require any work on Bedrock's side?

[janbrasna]

Bedrock has the page archived and serving subscription services redirect on the old URL: mozilla/bedrock#14187

[peiying2]

This one is addressed.

[flodolo]

This is not done…

The file is still there (last update in September 2018)
https://github.com/mozilla/legal-docs/blob/main/en/firefox_monitor_terms_privacy.md

Monitor is now Mozilla Monitor, and it's covered by the Subscription Services PN.