chore(main): release 0.9.3

[janezlapajne]

🤖 I have created a release beep boop

0.9.3 (2025-04-29)

Bug Fixes

• implement equality comparison method and add corresponding tests (9c19f07)

Documentation

• add API documentation links for Pixels, Signals, Signatures, Shape, SpectralImage, and SpectralImageSet classes (45fce51)
• add API documentation notes for core components in overview.md (e2ae548)
• enhance case study documentation with additional notes and formatting improvements (602494b)
• enhance documentation for Signals and Signatures classes with initialization examples (703adbf)
• reorganize and enhance SpectralImage section with initialization options (8929a4c)
• Replace PNG diagram with SVG format for entities schematics and remove the old PNG file. (6d5783f)
• restructure CONTRIBUTING.md to enhance clarity and organization (d25cdfb)

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[janezlapajne]

🤖 Created releases:

• v0.9.3

🌻