refactor well-known stuff to use proper ruma types, config types, etc

this does deprecate the original `well_known_` prefixed config options
with a dedicated/proper config sub-block (`[config.well_known]`)

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

Cargo.lock

@@ -522,6 +522,7 @@ dependencies = [
  "tracing-flame",
  "tracing-opentelemetry",
  "tracing-subscriber",
+ "url",
  "webpage",
 ]