v0.3.0

In this release

• ✨ A new class definition HvsrRotated for HVSR calculations considering azimuth.
• ✨ A new notebook azimuthal_hvsrpy_interface.ipynb specifically for azimuthal calculations.
• ✅ Significantly improved test coverage.
• 🐎 Various performance improvements.
• 📖 Various improvements to the documentation.