Add aptamer fingerprint SVG figures and update regression data processing

- Introduced new SVG figures for linear and ridge regression of aptamer fingerprints to enhance visual representation of model performance.
- Updated the regression data CSV to include additional features and ensure compatibility with the new figures.
- Modified the data processing script to remove columns with constant values, improving data quality for regression analysis.
- Enhanced exercise documentation to reflect changes in data handling and visualization, providing clearer guidance for users.

Author: carlportz