Expand Jobs Server Documentation

[justinegeffen]

The Jobs server section should be expanded to include details like the following:

• How to set up a Mattermost server as a worker
• The circumstances where you'd need a worker server as opposed to using all servers as both application and workers

Original issue: #13992.

[justinegeffen]

If you're interested in taking on this documentation request, let us know by commenting on the issue. The documentation that needs to be updated is located here: https://docs.mattermost.com/administration/config-settings.html#jobs. The original submitter of this issue (@icelander) may have additional links and content available.

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