GitHub Action: Apply external link format

docs/events/IUW/2025.md

@@ -2,7 +2,7 @@
 
 *4 February 2025, ETH*
 
-[**Program**](https://polybox.ethz.ch/index.php/s/ter5IrhnER0XXvg)
+[**Program** :material-download:](https://polybox.ethz.ch/index.php/s/ter5IrhnER0XXvg){:target="_blank"}
 
 ## Talks
 - [Simulations of present and future air quality with ICON-ART :material-download:](https://polybox.ethz.ch/index.php/s/2opiY8mKkP9jbwp){:target="_blank"}- Corina Keller, EMPA
@@ -18,14 +18,14 @@
 - [The effect of 3°C global warming on hail over Europe in COSMO-CLM :material-download:](https://polybox.ethz.ch/index.php/s/KeWxeTCI5nXndJO){:target="_blank"} - Iris Thurnherr, ETHZ
 - [Strengths and weaknesses of ICON in the mountains: insights from snow models and satellite observations :material-download:](https://polybox.ethz.ch/index.php/s/YtbPUR9HLZryCI2){:target="_blank"} - Bertrand Cluzet, SLF
 - [Getting ICON-CLM Ready for GPU on the New Alps Computing System :material-download:](https://polybox.ethz.ch/index.php/s/4DWqi7aKOJzYXET){:target="_blank"} - Michael Jähn, C2SM
-- [Impact on Land-Cover Dataset on Weather Forecasts with the ICON Model](https://polybox.ethz.ch/index.php/s/WaeRgq9zo6VMfda) - Andri Heeb, ETHZ
-- [Verification of hail in operational COSMO and ICON simulations vs. radar and crowd-sourced data](https://polybox.ethz.ch/index.php/s/jZxfQIKJYxqAEPR) - Kilian Brennan, ETHZ & Martin Aregger, UNIBE
+- [Impact on Land-Cover Dataset on Weather Forecasts with the ICON Model :material-download:](https://polybox.ethz.ch/index.php/s/WaeRgq9zo6VMfda){:target="_blank"} - Andri Heeb, ETHZ
+- [Verification of hail in operational COSMO and ICON simulations vs. radar and crowd-sourced data :material-download:](https://polybox.ethz.ch/index.php/s/jZxfQIKJYxqAEPR){:target="_blank"} - Kilian Brennan, ETHZ & Martin Aregger, UNIBE
 
 ### Session 2
 - [Machine independent testing of ICON :material-download:](https://polybox.ethz.ch/index.php/s/n6iSkDH9TftPM6J){:target="_blank"} - Annika Lauber, C2SM
 - [First application of FLEXPART-ICON for Swiss-scale Methane and Nitrous Oxide Emission Inversion :material-download:](https://polybox.ethz.ch/index.php/s/hfOOWK7f5lAlfGs){:target="_blank"} - Stephan Henne, EMPA
 - [Top-down estimates of CH4 and N2O emissions over Europe between 2010 and 2021 with ICON-ART :material-download:](https://polybox.ethz.ch/index.php/s/j8ycXITfC1r0ySr){:target="_blank"} - Joël Thanwerdas, EMPA
-- [Air-sea interaction in ICON](https://polybox.ethz.ch/index.php/s/kP7Tu00RUJwmHUl) - Aaron Wienkers, ETHZ
+- [Air-sea interaction in ICON :material-download:](https://polybox.ethz.ch/index.php/s/kP7Tu00RUJwmHUl){:target="_blank"} - Aaron Wienkers, ETHZ
 ### Session 3
 
 - [Final steps towards the optimization of ICON-HAM on Alps :material-download:](https://polybox.ethz.ch/index.php/s/xYXU2V2TjGwrac9){:target="_blank"} - Mikael Stellio, MeteoSwiss