long browser caching for everything except text/html (fixes #16)

docker/nginx.conf

@@ -14,6 +14,13 @@ http {
   access_log  /var/log/nginx/access.log  main;
   sendfile        on;
   keepalive_timeout  65;
+
+  # Expires map
+  map $sent_http_content_type $expires {
+    default                    30d;
+    text/html                  2h;
+  }
+
   server {
     listen       80;
     server_name  localhost;
@@ -21,13 +28,11 @@ http {
     # Hide nginx version
     server_tokens off;
 
-    # TODO: maybe setup cache as well
-
     location / {
       root   /app;
       index  index.html;
       try_files $uri $uri/ /index.html;
-      expires 1d;
+      expires $expires;
       add_header Pragma public;
       add_header Cache-Control "public";
     }