✨ Update .gitignore to include *.stl and *.geojson file types

Author: ZenanH

.gitignore

@@ -25,4 +25,7 @@ docs/site/
 # It records a fixed state of all packages used by the project. As such, it should not be
 # committed for packages, but should be committed for applications that require a static
 # environment.
-Manifest.toml
+Manifest.toml
+
+*.stl
+*.geojson