Use gzip compression in nginx

Signed-off-by: William Brawner <me@wbrawner.com>

Dockerfile

@@ -1,3 +1,4 @@
 FROM nginx:latest
+COPY gzip.conf /etc/nginx/conf.d
 COPY src /usr/share/nginx/html
 

gzip.conf

@@ -0,0 +1,13 @@
+gzip on;
+gunzip on;
+gzip_types
+    text/plain
+    text/css
+    text/js
+    text/xml
+    text/javascript
+    application/javascript
+    application/json
+    application/xml
+    application/rss+xml
+    image/svg+xml;