Update _index.md

Author: johannag126

content/news/Newsletters/_index.md

@@ -10,6 +10,8 @@ tags:
 
  Links to our past newsletters are below.
 ### 2025
+* 03/03/2025 - [M²LInES newsletter - March 2025](https://mailchi.mp/14656511dff3/m2lines-mar2025)
+
 * 02/04/2025 - [M²LInES newsletter - February 2025](https://mailchi.mp/382387c99943/m2lines-feb2025-2)
 
 * 01/02/2025 - [M²LInES newsletter - January 2025 - Happy new year!](https://mailchi.mp/9d6e3eddad27/m2lines-jan2025)