feat: impl docs (#4)

The entire public api is covered with documentation in two languages - Russian and English.

the library now supports the latest three versions of python - 3.12, 3.13 and 3.14

minor design changes: now, when a Boolean flag is entered, its value is an empty string, not None.

tests have been adapted to the supported versions of python, readmi has been redesigned in two languages, German is no longer available.

docs/code_snippets/response/snippet5.py

@@ -0,0 +1,29 @@
+from argenta import Command, Response, Router
+
+router = Router(title="Delete Data Example")
+
+
+@router.command(Command("store", description="Store data"))
+def store_handler(response: Response):
+    response.update_data(
+        {
+            "temp_key": "temporary value",
+            "important_key": "important value",
+            "another_key": "another value",
+        }
+    )
+    print("Data stored")
+
+
+@router.command(Command("remove", description="Remove specific key"))
+def remove_handler(response: Response):
+    # Delete specific key from storage
+    try:
+        response.delete_from_data("temp_key")
+        print("Key 'temp_key' deleted")
+
+        # Check what remains
+        remaining = response.get_data()
+        print(f"Remaining keys: {list(remaining.keys())}")
+    except KeyError:
+        print("Key not found")