config: add VS Code workspace, remove lintr

Adds a repository workspace file for VS Code to centralize editor settings and removes an outdated linter configuration file.

Improves developer environment consistency and avoids committing project-specific linter rules that are no longer needed.

Author: jimbrig

.lintr

@@ -0,0 +1,8 @@
+{
+  "folders": [
+    {
+      "path": "."
+    }
+  ],
+  "settings": {}
+}