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>

src/config/mod.rs

@@ -170,6 +170,10 @@ pub struct Config {
 pub struct TlsConfig {
     pub certs: String,
     pub key: String,
+    #[serde(default)]
+    /// Whether to listen and allow for HTTP and HTTPS connections (insecure!)
+    /// Only works / does something if the `axum_dual_protocol` feature flag was built
+    pub dual_protocol: bool,
 }
 
 const DEPRECATED_KEYS: &[&str] = &["cache_capacity"];