proxy: User ReverseProxy.Rewrite instead of Director

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With Go 1.20 the "Rewrite" hook for ReverseProxy was introduced to
supersede of the "Director" hook (see:
https://github.com/golang/go/commit/a55793835f16d0242be18aff4ec0bd13494175bd)

The Rewrite hooks allows for better separation between the incoming and
outgoing request. In particular it makes it pretty easy to set the
correct X-Forwarded-* Headers on the outgoing request.
The need for using "Rewrite" came up when trying to embed
authelia. It uses the X-Forwarded-Host and X-Forwared-Proto headers to
e.g. compute the correct return values for the various endpoints in
.well-known/openid-configuration.

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