Add Sentry deprecation notice

BYK · BYK · commit aa7f7d8e938b · 2020-09-08T14:56:10.000+03:00
See docker-library/official-images#8673
diff --git a/sentry/deprecated.md b/sentry/deprecated.md
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+This image is deprecated in favor of the full installation explained over at [Self-Hosted Sentry Docs](https://develop.sentry.dev/self-hosted/) (last updated July 2019; [getsentry/docker-sentry#189](https://github.com/getsentry/docker-sentry/pull/189).

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	`1`	`+This image is deprecated in favor of the full installation explained over at [Self-Hosted Sentry Docs](https://develop.sentry.dev/self-hosted/) (last updated July 2019; [getsentry/docker-sentry#189](https://github.com/getsentry/docker-sentry/pull/189).`