Replace scikit-fda by handmade Nadaraya-Watson smoothing

pyproject.toml

@@ -40,7 +40,6 @@ stable-baselines3 = {version=">=2.4.1", optional=true}
 tensorboard = {version="*", optional=true}
 torch = {version=">=2.3", optional=true}
 pandas = "*"
-scikit-fda = {git = "https://github.com/GAA-UAM/scikit-fda.git", branch = "develop", optional=true}
 nox = {version="*", optional=true}
 sphinx = {version="6.2.1", optional=true}
 sphinx-gallery = { version= "^0.14.0", optional=true}