Update website structure and project metadata

[niksirbi]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?

Our website was very barebones, with almost no information about the project (beyond the benchmark dataset spec).

What does this PR do?

Overhauls the README, the website and project metadata. Specifically:

• Updated project metadata in pyproject.toml (description, authors, URLs)
• Updated copyright and authorship in Sphinx conf,py to "The poseinterface developers"
• Converted docs landing page from RST to MyST markdown with sphinx-design grid cards
• Added "About" section with sub-pages: Mission, Team, License, Code of Conduct
• Added a minimal Contributing guide (docs/source/contributing.md) with dev setup, contribution workflow (links to movment for now), testing, linting, and CI
• Renamed benchmark spec page from project_structure to benchmark-dataset
• Added custom myst_url_schemes in conf.py
• Unified project description and mission across README, docs homepage, and mission page

References

Closes #12.

How has this PR been tested?

Local documentation build. I suggest testing it in the same way.

Is this a breaking change?

No.

Does this PR require an update to the documentation?

N/A

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[sfmig]

Thanks @niksirbi it looks great! Will merge now

[sfmig]

badges! 🤩