content: mention Matrix alongside Slack (#1496)

_data/l10n.yml

@@ -141,7 +141,7 @@ it:
     credits_maintainers: Mantainer
     banner_joinus_h2: Sei un programmatore, uno smanettone del codice o un nerd in erba?
     banner_joinus_h1: Unisciti alla nostra community!
-    banner_joinus_action: Vieni su Slack
+    banner_joinus_action: Vieni su Slack e Matrix
     banner_PNRR_h2: |
       Soluzioni e programmi che possono contribuire al raggiungimento degli obiettivi del Piano Nazionale di Ripresa
       e Resilienza (PNRR) e agli avvisi pubblicati da <a href="https://padigitale2026.gov.it" target="_blank" rel="noopener noreferrer">PA digitale 2026</a>
@@ -586,7 +586,7 @@ en:
     credits_maintainers: "Projects leaders & maintainers:"
     banner_joinus_h2: Are you a developer, a coder or a geek?
     banner_joinus_h1: Join our community!
-    banner_joinus_action: Chat on Slack now
+    banner_joinus_action: Chat on Slack and Matrix now
     how_to_use: How do I use it
     banner_PNRR_h2: Solutions and softwares that can contribute to the achievement of PNRR objectives by PA digitale 2026
     banner_PNRR_h1: Software PNRR

_data/tools.yml

@@ -7,12 +7,12 @@ it:
     alt: Logo Forum Italia
     img: /assets/images/tools/Forum_Logo.svg
   -
-    title: Slack
-    subtitle: "**Dialoga e collabora in tempo reale** con i maintainer e gli altri sviluppatori sullo Slack di Developers Italia."
+    title: Slack e Matrix
+    subtitle: "**Dialoga e collabora in tempo reale** con i maintainer e gli altri sviluppatori sullo Slack e il server Matrix di Developers Italia."
     icon: comment
     url: https://slack.developers.italia.it/
-    alt: Logo Slack
-    img: /assets/images/tools/Slack_Logo.svg
+    alt: Logo Slack e Matrix
+    img: /assets/images/tools/Slack_Matrix.svg
   -
     title: Codice sorgente
     subtitle: "In **github.com/italia** sviluppiamo (insieme) gli SDK e gli esempi di supporto delle piattaforme nazionali."
@@ -36,11 +36,11 @@ en:
     url: https://forum.italia.it
     img: /assets/images/tools/Forum_Logo.svg
   -
-    title: Slack
-    subtitle: "**Chat and collaborate in real time** with the maintainers and the other developers in the Slack of Developers Italia."
+    title: Slack and Matrix
+    subtitle: "**Chat and collaborate in real time** with the maintainers and the other developers in the Slack and Matrix server of Developers Italia."
     icon: comment
     url: https://slack.developers.italia.it/
-    img: /assets/images/tools/Slack_Logo.svg
+    img: /assets/images/tools/Slack_Matrix.svg
   -
     title: Source Code
     subtitle: "In **github.com/italia** we develop (together) SDKs and examples for national platforms."