feat!: initialize documentation site and restructure config yaml

[fentas]

This pull request introduces several important changes to the configuration and state management of the b CLI tool, as well as adds initial documentation infrastructure. The main focus is on refactoring the configuration format to use a top-level binaries key, updating the internal state representation, and aligning related code and tests. Additionally, new files are added to support documentation deployment and frontend tooling.

Configuration and State Refactor

• The configuration format in b.yaml now uses a top-level binaries key, grouping all managed binaries under it. This change is reflected in the config file, code, and documentation. [1] [2] [3]
• A new State struct is introduced in pkg/state/types.go to encapsulate the list of binaries, replacing the previous use of BinaryList alone. All code that previously used BinaryList for configuration now uses State, including CLI logic and tests. [1] [2] [3] [4] [5]
• YAML marshalling and unmarshalling logic is updated to support the new State structure, ensuring correct serialization of the config file. [1] [2]

Code and Test Updates

• All CLI commands and options that previously referenced BinaryList for configuration now reference the new State type, including logic for loading, saving, and updating configs. [1] [2] [3] [4]
• End-to-end and unit tests are updated to expect the new config format and structure, including checks for the presence of the binaries key and proper binary references. [1] [2] [3]

Documentation and Frontend Tooling

• Adds a GitHub Actions workflow (.github/workflows/docs.yml) to build and deploy documentation using Docusaurus to GitHub Pages.
• Introduces frontend tooling configuration files for the documentation site, including ESLint (www/.eslintrc.js), Prettier (www/.prettierrc), Yarn (www/.yarnrc.yml), and .gitignore for the www directory. [1] [2] [3] [4]
• Adds a README for the documentation site with details on its structure and purpose.

Documentation and Reference Updates

• Updates references from arg-sh/argsh to fentas/b in code, documentation, and comments to reflect the new repository location and naming. [1] [2] [3]

---

References: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28]

[fentas]

This is still rough. Would clean it up more, but no time.