chore: update README to oxibus org

[nyurik]

• Change all links to the new home
• Cleanup badges
• Add crate categories

[Copilot]

Pull Request Overview

Updates the repository ownership from marcelbuesing to the oxibus organization across all documentation and configuration files. The changes modernize the badge display and add proper crate categorization for better discoverability.

• Migrated all repository references from marcelbuesing/can-dbc to oxibus/can-dbc
• Updated README badges with modern styling and improved organization
• Added crate categories to Cargo.toml for better crates.io classification

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
README.md	Updated all badge URLs and reorganized badges with modern styling
Cargo.toml	Changed repository URL, removed deprecated badges section, added crate categories
CHANGELOG.md	Updated all version links to point to the new oxibus organization

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