Standalone build mode for offline viewing

[irisli]

Right now, the build process assumes that the build will be hosted online.

We can consider making a mode that compiles the developers site into an more offline-friendly archive. It can compressed well (zip, tar.gz, bzip2) to save bandwidth. Then, we can have weekly builds on the releases page. This way, people connected to free wifi can download the archive when bandwidth is cheap for them and view offline without using extra bandwidth.