Compress compiled HTML before uploading

See #2915 (comment 153356) for my reasoning. TLDR: Minifying max -15%, compressing -75% size.

@Pregmodder I'll need to replace our custom docker container with one that has zip installed. For that I'll need Developer access again. Not today though, already pretty late.

docker/megacmd/Dockerfile

@@ -6,12 +6,17 @@
 # Debug build process
 # docker build --no-cache --progress=plain -t megacmd .
 
-#Create debian as base image
+# Create debian as base image
 FROM debian
 
-#Install packages
+# Update
 RUN apt-get -y update
 RUN apt-get -y upgrade
+
+# Install zip
+RUN apt-get -y install zip
+
+# mega cmd
 # Install dependencies, when changing mega versions these may need to be adjusted
 RUN apt-get -y install libc-ares2 libcrypto++6 libmediainfo0v5 libpcrecpp0v5 libzen0v5
 # Install mega cmd