Host a static copy of forums.whatwg.org

Static copy was made in whatwg/whatwg.org#118.

Some tricks are needed to make most old URLs work.

debian/marquee/DOMAINS

@@ -6,6 +6,7 @@ domparsing.spec.whatwg.org
 encoding.spec.whatwg.org
 fetch.spec.whatwg.org
 figures.idea.whatwg.org,figures.spec.whatwg.org
+forums.whatwg.org
 fullscreen.spec.whatwg.org
 html-differences.whatwg.org
 html.spec.whatwg.org,c.whatwg.org,developer.whatwg.org,developers.whatwg.org,help.whatwg.org,xn--7ca.whatwg.org

debian/marquee/nginx/sites/forums.whatwg.org.conf

@@ -0,0 +1,30 @@
+server {
+    server_name forums.whatwg.org;
+    root /var/www/forums.whatwg.org;
+
+    ssl_certificate /etc/letsencrypt/live/forums.whatwg.org/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/forums.whatwg.org/privkey.pem;
+
+    include /etc/nginx/whatwg.conf;
+
+    location / {
+        index index.php;
+    }
+
+    location = / {
+        return 301 /bb3/;
+    }
+
+    location ~ \.php {
+	default_type text/html;
+
+	# strip &sid=... from the query string if present
+	if ($args ~ ^(.*?)&?sid=[a-z0-9]*$) {
+	    set $stripped $1$2;
+            rewrite ^(.*)$ $1?$stripped? permanent;
+	}
+
+	# look for files with ? in the filename first
+	try_files "${uri}?${args}" $uri =404;
+    }
+}

test/redirects.js

@@ -64,7 +64,8 @@ const HTTPS_TESTS = [
   ['https://domparsing.spec.whatwg.org/', 302, 'https://w3c.github.io/DOM-Parsing/', 'drop'],
   ['https://encoding.spec.whatwg.org/index-gbk.txt', 410],
   ['https://figures.spec.whatwg.org/', 302, 'https://figures.idea.whatwg.org/', 'keep'],
-  ['https://forums.whatwg.org/', 301, 'https://forums.whatwg.org/bb3/index.php'],
+  ['https://forums.whatwg.org/', 301, 'https://forums.whatwg.org/bb3/'],
+  ['https://forums.whatwg.org/bb3/viewtopic.php?f=3&p=8538&sid=1cb9e434c59258d940d476648b0301df', 301, 'https://forums.whatwg.org/bb3/viewtopic.php?f=3&p=8538'],
   ['https://help.whatwg.org/', 301, 'https://html.spec.whatwg.org/dev/', 'drop'],
   ['https://html.spec.whatwg.org/C', 301, 'https://html.spec.whatwg.org/multipage/', 'keep'],
   ['https://html.spec.whatwg.org/complete', 301, 'https://html.spec.whatwg.org/', 'keep'],