Updated `Index.cshtml`:
- Added icons and a more descriptive project title.
- Introduced a new introductory paragraph explaining the app's purpose.
- Replaced the old alert section with a detailed workflow explanation.
- Added cards for invoice upload and summary navigation.
- Included a technology stack section with badges for key tools.
Updated `Details.cshtml`:
- Replaced text-based icons with DevExpress icons for titles, buttons, and attachments.
- Improved attachment handling with `<i>` tags and consistent icon usage.
- Updated "No attachments" message to include an icon.
These changes enhance the UI's visual consistency, usability, and professionalism.
Removed `SampleDataController`, `SampleData`, and `SampleOrder`
classes, along with the `DevExtreme` DataGrid in `Index.cshtml`,
to eliminate reliance on mock data and sample orders.
Updated `Index.cshtml` to introduce a welcome message and
informational section about ZUGFeRD/Factur-X invoice processing,
highlighting features like PDF/A upload, XML extraction, and
result PDF creation. Added navigation links for invoice-related
actions.
Updated `DXApp.TemplateKitProject.csproj` to include a new
`<ItemGroup>` for the `Controllers` folder, preparing the
project structure for future development.
