Design & Implement App Bundle System for deploying apps on the server

[taoeffect]

Problem

At the moment the "framework" and Group Income are in the same repo, and there is no way to properly deploy the server (see #10 - an outdated issue on this topic).

Solution

What we need is to be able to run the server independently and install apps on it that are bundled & signed zip files for individual apps (like Group Income) that use the framework.

First we need to design a format for these zip/pak files. A simple method is best, and I'm thinking of a 2-tiered zip file: tier 1 is the inner layer that zips up a folder containing an index.html file that loads the app. Tier 2 is a zip file containing the previous zip file and a manifest.json file with a signature and other information about the authors of the app. The exact format of this manifest needs to be determined. The entire zip file (along with the manifest) can be created using the chel command.