Shacking up the category tree

[Minh Ha Duong]

Hi,

Building upon Ferenc's work, I just went trough some reorganization of the 
category tree. Notes: 
- Trying to keep the tree only one levels deep: categories and subcategories. 
- Trying to fit with the implicit mental model that people had in mind when 
tagging the pages.

That implies "Intended Audience" and "Maturity Level" (words borrowed from 
Freshmeat classification), and "Distributions" as top-level categories.

- I see "Community" more as "Social groups" than "Everything that is not 
Openmoko Inc.". So I want to move "Openmoko Inc." there too.
- I want to rename "Technical" to something like "Environment" 
- I want to rename "Hardware" to something like "Functional subsystem" 
- "Software" can go 

Minh