Remove leftover files for Lighthouse workflow [skip ci]

Leftover after removal in 1574cd8515

Caddyfile

@@ -1,9 +0,0 @@
-# vim: ft=caddyfile
-
-https://localhost {
-    header Cache-Control no-cache
-    root * public/
-    file_server {
-        precompressed br gzip
-    }
-}

changed-urls.sh

@@ -1,8 +0,0 @@
-#!/bin/sh
-
-diff -qrNtbB old/ new/ |
-    grep -oP '(?<=\s)new\/\S*' |
-    xargs -d '\n' ls -1d 2>/dev/null |
-    grep 'index.html$' |
-    sed 's/index.html$//' |
-    sed "s/^new/${SCHEME:=http}:\/\/${DOMAIN:=example.com}/"

lighthouserc.yaml

@@ -1,5 +0,0 @@
-ci:
-  collect:
-    startServerCommand: sudo caddy run
-    settings:
-      chromeFlags: "--ignore-certificate-errors --throttling.cpuSlowdownMultiplier=2.4"