add support for dual HTTP/HTTPS, rm caddy from complement

complement sends C-S requests over HTTP, and federation
over HTTPS.

complement without caddy *almost* works. unfortunately
i am now dealing with invalid X-Matrix signatures
due to non-percent encoded URIs and it does not
seem trivial to percent-encode URIs that a
reverse proxy would normally do for you.

Signed-off-by: strawberry <strawberry@puppygock.gay>