Adds a first version of the documentation, describing the
architecture and features of the weight loss system.
This documentation includes:
* A high-level overview of the system's components.
* Details on public access and admin functionalities.
* A description of the frontend/backend architecture.
* Mockups of the user interfaces.
Good taste requires questioning if this is a real problem or imagined,
and if there is a simpler method. We must consider if this implementation
breaks anything and ensure user space is not disrupted. This provides
a baseline to build upon, but needs to be refined as the project evolves.
The code is not garbage, but simplification might be possible.
