Fixing continuous barycenter, cleaning up docs and more generally the packaging of OTT.

What's Changed

• Pre-commit by @michalk8 in #71
• Fix/online gw by @michalk8 in #80
• Feature/improve packaging by @michalk8 in #82
• Ersi gauss bary by @ersisimou in #81

New Contributors

• @ersisimou made their first contribution in #81

Full Changelog: 0.2.6...0.2.7