debian: improve compressions + add expire headers

* Improve compressions + add expire headers
* Remove MSIE check, caching only for versioned files, do not gzip MP3/JPG/PNG
* Lower GZIP min length, enable compressions on WASM

doc/debian/jitsi-meet/jitsi-meet.example

     error_page 404 /static/404.html;
 
     gzip on;
-    gzip_types text/plain text/css application/javascript application/json;
+    gzip_types text/plain text/css application/javascript application/json image/x-icon application/octet-stream application/wasm;
     gzip_vary on;
+    gzip_proxied no-cache no-store private expired auth;
+    gzip_min_length 512;
 
     location = /config.js {
         alias /etc/jitsi/meet/jitsi-meet.example.com-config.js;
     {
         add_header 'Access-Control-Allow-Origin' '*';
         alias /usr/share/jitsi-meet/$1/$2;
+
+        # cache all versioned files
+        if ($arg_v) {
+          expires 1y;
+        }
     }
 
     # BOSH

doc/example-config-files/jitsi.example.com.example

         ssi on;
     }
 
+    gzip on;
+    gzip_types text/plain text/css application/javascript application/json image/x-icon application/octet-stream application/wasm;
+    gzip_vary on;
+    gzip_proxied no-cache no-store private expired auth;
+    gzip_min_length 512;
+
     # BOSH
     location /http-bind {
         proxy_pass      http://localhost:5280/http-bind;

doc/example-config-files/multidomain/jitsi.example.com.multidomain.example

         tcp_nodelay on;
     }
 
+    gzip on;
+    gzip_types text/plain text/css application/javascript application/json image/x-icon application/octet-stream application/wasm;
+    gzip_vary on;
+    gzip_proxied no-cache no-store private expired auth;
+    gzip_min_length 512;
+
     location ~ ^/([^/?&:'"]+)$ {
         try_files $uri @root_path;
     }