Reorder and reorganize the README for better utility

[aiuto]

We can move "Implemented" and Dropped to a history index. The main view should show what is interesting. The priority for that is

1. What is under review
2. What is in draft

But why is Draft even there are all? Once you tell people about it, it is out for review, even if you don't think you want comments about it. If you want to share something with just a few people, you should do that via other channels.