Start hardware page populated from Hex

[jjcarstens]

• Fetches all dependents of nerves_system_br which is the underlying tool to make a system for hardware
• Sorts the official systems first
• Displays hex info and if dependencies are up to date (which is basically checking nerves_system_br

We're working through ideas of supporting extra metadata from hex, but the shape is not 100% defined yet. There is an implementation in here for the first idea, but it doesn't populate anything right now.

Current

Proposed with metadata

[fhunleth]

@jjcarstens I started some metadata at https://github.com/fhunleth/nerves_system_npi_imx6ull/pull/73/files. I chose key names that were programmer friendly for two reasons: 1. if we translate the Nerves website, we'll want to replace the key names anyway, and 2. I was hoping to be able to standardize keys for future use. One future use might be a board-picking wizard that asks you questions and filters Nerves systems for you. Another might be a table view of systems.

Questions:

1. Any reason to name space the keys? My feeling is no since the :extra attribute is used so little as it is.
2. What other keys seem useful? I kept on thinking about options and was trying to not put everything. The only one that I'm highly leaning towards is whether the system supports making a Scenic, Flutter, or web kiosk.