Proposed changes

Problem: Document NGINX config file limits (#63)

Solution:
Added config file size limits on theAdd a file to an instance page.

Testing: Tested on local machine on running the Hugo server locally. Screenshot of change:

Please focus on (optional): Proposed solution onIssue#63 was to add the config file size limits on theAdd an NGINX instance page.
However, theAdd a file to an instance page seems like a better place to add this information.@mjang Please could you review this and suggest changes?

If this PR addresses anissue on GitHub, ensure that you link to it here:

ClosesIssue#63

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