docs: improve docs a bit more

server.ts

@@ -1,12 +1,21 @@
+/**
+ * SERVERUS SERVER module
+ * @module
+ */
+
 import * as colors from '@std/fmt/colors';
 import * as fs from '@std/fs';
 import * as path from '@std/path';
 
 const DEFAULT_HANDLER_DIRECTORIES = [path.resolve(path.join(path.dirname(path.fromFileUrl(import.meta.url)), 'handlers'))];
 
+/** A `HANDLER` must take a `Request` and return a `Response` if it can handle it. */
 type HANDLER = (request: Request) => Promise<Response | null | undefined> | Response | null | undefined;
+
+/** A `LOGGER` must take a `Request`, a `Response`, and a `processing_time` and log it. */
 type LOGGER = (request: Request, response: Response, processing_time: number) => void | Promise<void>;
 
+/** A `HANDLER_MODULE` must export a default method and may export an unload method to be called at shutdown. */
 interface HANDLER_MODULE {
 	default: HANDLER;
 	unload?: () => void;