Redesign admin peering settings and catalogs

public/peer-catalog.html

@@ -0,0 +1,10 @@
+<!doctype html>
+<html lang="en">
+<head>
+<meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
+<title>Peer catalogs · MangaCircus</title>
+<link rel="stylesheet" href="app.css"><link rel="icon" href="icon.svg">
+<script src="common.js" defer></script><script src="peer-catalog.js" defer></script>
+</head>
+<body><main><p class="loading">Loading peer catalogs…</p></main><dialog id="peer-manga-dialog" class="peer-manga-dialog"></dialog></body>
+</html>