Add HTML and ZIP file to make the result section better

Via this MR we introduce an HTML page and ZIP file to make the way of getting access to the produced data and understanding the directory structure of plugin output easier

example: https://www-regiklim.dkrz.de/history/6371/results/

src/pet/calculate_pet.sh

@@ -294,5 +294,5 @@ for ((YEAR=$START_YEAR;YEAR<END_YEAR+1;YEAR+=1)); do
 }
 done
 wait
-
+cd ${OUTPUT_DIR_VAR} && zip -r ${OUTPUT_DIR_VAR}/01_produced_data.zip . && cd -
 echo '*** Calculation done ***'