Change start page of the application

[mrauhala]

This repository is starting point for vibe coding trainees to start creating issues to implement nice weather app. App will get its data from the EDR service as there is already starting point for that. Data is available from EDR API like this https://opendata.fmi.fi/edr/collections/pal_skandinavia/position?f=CoverageJSON&parameter-name=TotalCloudCover%2CWindSpeedMS%2CWindDirection%2CTemperature%2CPrecipitation1h%2CPoP%2CHumidity%2CHourlyMaximumGust%2CDewPoint&datetime=2025-11-22T22%3A00%3A00Z%2F2025-12-07T12%3A00%3A00Z&coords=POINT%289.886+62.025%29

Create instructions for the trainees (displayed in the staring page) how to start vibe coding by creating issues and so on.