Use vertx or resteasy to do the "/d" rewrite

**Description**
Currently we are using undertow to rewrite the url from /d?.. to /api/download?..
https://github.com/quarkusio/code.quarkus.io/blob/main/api/src/main/resources/META-INF/undertow-handlers.conf#L1

We should now use vertx or resteasy to do that so we can remove the undertow dependency.


