Version 1.0.0

[NicolasGuilloux]

This is a big cleaning of the repository. The goal is to tidy things up by:

• separating the features,
• making the files less hard to read
• adding some comments for a easier understanding
• exporting some function into the utilities to make the files lighter
• rechecking some feature implementation, some of them were not available on home-manager

After this cleaning, the repository will be at the version v1.0.0.

• The tag version naming will change from drv-v*.*.* to v*.*.*
• A changelog file will be present at the root of the repository
• A Code of Conduct with some other documentation will be present to explain various things such as the versionning for instance