Add package documentation and deploy to Read The Docs

• Change package name description from majis to majis-ops (import remains unchanged)
• Reorganize hatch environments (no longer in a single .venv)
• Bump hatch min version (now 1.12)
• Remove CI build step (only use linter stage)
• Split ruff check and format scripts
• Add new docs development environment in hatch configuration
• Add jupyter-book dependency as the main docs dependency.
• Add explicit documentation in docs/
• Add documentation for read_itl, Timeline and majis-itl CLI.
• Add API reference for all [sub]modules.
• Fix minor typos (mainly in docstrings)
• Add status badges to the project
• Add new package logo
• Trigger CI only if python files are changed
• Disable tests on multiple python version in CI when MR is draft
• Add ReadTheDocs deployment webhook in CI deploy stage
• Add readthedocs.yaml configuration.
• Push public documentation to readthedocs: majis-ops.readthedocs.io