Feature/pre release changes

This MR collects a few minor changes before the release. These include:

• example runner
• improvements to the release package
• README rework

src/vapython/examples/__main__.py

+import importlib
+import sys
+from pathlib import Path
+
+
+def main():
+    current_path = Path(__file__).parent
+
+    example_files = list(current_path.glob("*example*.py"))
+
+    if len(sys.argv) == 1:
+        for i, example_file in enumerate(example_files):
+            print(f"{i}: {example_file.stem}")
+
+        print(f"{len(example_files)}: Exit")
+
+        example_index = int(input("Enter the index of the example you want to run: "))
+    else:
+        example_index = int(sys.argv[1])
+
+    if example_index == len(example_files):
+        return
+
+    if example_index < 0 or example_index >= len(example_files):
+        print("Invalid index")
+        return
+
+    example_file = example_files[example_index]
+    module_name = f"pigeon.examples.{example_file.stem}"
+    module = importlib.import_module(module_name)
+
+    example_main = getattr(module, "main", None)
+    if example_main is not None:
+        example_main()
+    else:
+        print(f"Could not find 'main' function in module '{module_name}'")
+
+
+if __name__ == "__main__":
+    main()