Refactor DESCRIPTION and remove legacy scripts

- Updated DESCRIPTION file to remove unnecessary dependencies and streamline imports.
- Deleted multiple legacy R scripts related to hexagonal and square grid processing, raster trimming, and visualization to clean up the repository.
- This cleanup enhances maintainability and focuses on the current implementation of the package.

Author: MaxMLang

DESCRIPTION

@@ -17,11 +17,9 @@ LazyData: true
 Depends: R (>= 4.0.0)
 LinkingTo: Rcpp
 Imports:
-    Rcpp,
     sf (>= 1.0.0),
     terra (>= 1.6.0),
-    exactextractr (>= 0.8.0),
-    data.table (>= 1.14.0)
+    exactextractr (>= 0.8.0)
 Suggests:
     testthat (>= 3.0.0),
     knitr,