add documentation to proxy Prometheus behind Nginx
Description
It is hard to proxy Prometheus behind Nginx in gitlab CE, the documentation is not enough for this.
Documentation blurb
Overview
This documentation page shows that you may need to proxy prometheus behind Nginx to access it in case you enabled HTTPS on your server, it also refers to this page to get help in adding the proxy but the page does not provide enough documentation for beginners to add the proxy block.
Use cases
Everyone who needs to use prometheus to monitor their gitlab instance.
Feature checklist
Make sure these are completed before closing the issue, with a link to the relevant commit.
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Documentation