feat: :sparkles: Build WebCT as a single-file no-dependency exe (#57)

[WYVERN2742]

• Create a bundled exe using pyinstaller for windows
  • Includes a splash screen, all python dependencies and gpu libraries
  • Windows exe also contains version information
  • Add pyinstaller hooks
  • create hooks for cil, astra, spekpy, and tigre
  • Use openblas for numpy and family to avoid the use of intel mkl, reducing the exe size by 500MB
• check for ./data/ folder on startup and error when missing
  • on windows, display an error box, otherwise the user gets no feedback