Convert to new warning/trigger setup

• refactor: use /events/process and also call in no-event upload
• refactor: replace alert_threshold by forecast_severity and forecast_trigger
• refactor: use same 'date' in all api-calls

Update VCI data url

v0.2.5

change vci data url

v0.2.4

• Update python env
• Update xgboost package
• Reorder input data in arrange_data()
• Update objects of forecast model 2 and 3 based on new data order

v0.2.3

Minor fix:

• Correct leadtime_str in the API payload

v0.2.2

• Correct arrange_data() to get and merge all past CHIRPS and VCI data
• Add date to API payloads
• Add github workflow to automate ACR image update