Increase ddev-router nginx timeout

[rfay]

What happened (or feature request):

We have increased the nginx timeout quite significantly on the web container, but never increased it on the router. This means it actually times out quite fast.

We just need to increase the nginx timeout in the ddev-router.

What you expected to happen:

How to reproduce this:

Version: Please include the output of ddev version, docker version and the project's .ddev/config.yaml.

Anything else do we need to know:

Related source links or issues:

Please use a complexity rating of 1-5 (5 is high) for a feature request. (High complexity implies more PR planning)