Delete old notebook, update hazard.rst, and add new notebook

Author: DahyannAraya

…imada_copernicus_seasonal_forecast.ipynb …azard_copernicus_seasonal_forecast.ipynbdoc/user-guide/climada_copernicus_seasonal_forecast.ipynb renamed to doc/user-guide/climada_hazard_copernicus_seasonal_forecast.ipynb doc/user-guide/climada_copernicus_seasonal_forecast.ipynb renamed to doc/user-guide/climada_hazard_copernicus_seasonal_forecast.ipynb

@@ -11,3 +11,4 @@ that handle tropical cyclones and winter storms more specifically.
     climada_hazard_Hazard
     Tropical Cyclones <climada_hazard_TropCyclone>
     European Winter Storms <climada_hazard_StormEurope>
+    Copernicus Seasonal Forecast Tools <climada_hazard_copernicus_seasonal_forecast>