[docker] router.php isn't used any more

tests/router.php

@@ -1,36 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Shimmie2;
-
-// custom routing for stand-alone mode, basically
-// .htaccess for the built-in php web server
-if (PHP_SAPI !== 'cli-server') {
-    die('cli only');
-}
-
-// warehouse files
-$matches = [];
-if (preg_match('/\/_(images|thumbs)\/([0-9a-f]{2})([0-9a-f]{30}).*$/', $_SERVER["REQUEST_URI"], $matches)) {
-    header('Content-Type: image/jpeg');
-    header("Cache-control: public, max-age=86400");
-    print(file_get_contents("data/$matches[1]/$matches[2]/$matches[2]$matches[3]"));
-    return true;
-}
-
-// if file exists, serve it as normal
-elseif (is_file("." . explode("?", $_SERVER["REQUEST_URI"])[0])) {
-    return false;
-}
-
-// all other requests (use shimmie routing based on URL)
-else {
-    unset($matches);
-    // PHP_SELF is very unreliable, but there's no(?) better way to know what
-    // website subdirectory we're installed in - if we're using router.php, then
-    // let's blindly assume that we're in the root directory.
-    $_SERVER["PHP_SELF"] = "/index.php";
-    $_GET['q'] = urldecode(explode("?", $_SERVER["REQUEST_URI"])[0]);
-    require_once "index.php";
-}