Update banner text: Solid26 as new standard release, add symposium and hackathon links

Co-authored-by: jeswr <63333554+jeswr@users.noreply.github.com>
Agent-Logs-Url: https://github.com/solid/solidproject.org/sessions/8b4efea0-7fad-4a3c-bc90-e59053d6bc9a

Author: Copilot

Gemfile.lock

@@ -12,8 +12,12 @@ GEM
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
     eventmachine (1.2.7)
+    ffi (1.17.2-x86_64-linux-gnu)
     ffi (1.17.2-x86_64-linux-musl)
     forwardable-extended (2.6.0)
+    google-protobuf (4.32.0-x86_64-linux-gnu)
+      bigdecimal
+      rake (>= 13)
     google-protobuf (4.32.0-x86_64-linux-musl)
       bigdecimal
       rake (>= 13)
@@ -67,15 +71,17 @@ GEM
     rexml (3.4.2)
     rouge (4.6.0)
     safe_yaml (1.0.5)
-    sass-embedded (1.92.0)
+    sass-embedded (1.92.0-x86_64-linux-gnu)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.92.0-x86_64-linux-musl)
       google-protobuf (~> 4.31)
-      rake (>= 13)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     unicode-display_width (2.6.0)
     webrick (1.9.1)
 
 PLATFORMS
+  x86_64-linux-gnu
   x86_64-linux-musl
 
 DEPENDENCIES

_layouts/default.html

@@ -36,7 +36,7 @@
       </button>
     </header>
     <div class="event-banner" role="region" aria-label="Event announcement">
-      📣 Join us for <a href="https://solid26.org/">Solid26</a> — Solid Symposium (Apr 30 – May 1) · Solid Hackathon (Apr 27 – 29) · London, 2026
+      📣 <a href="https://solid26.org/">Solid26</a> — a new release of the Solid standard — launches at the <a href="https://sosy2026.eu/">Solid Symposium</a> (Apr 30 – May 1) · <a href="https://sosy2026.eu/">Solid Hackathon</a> (Apr 27 – 29) · London, 2026
     </div>{% if page.breadcrumbs %}
     <nav class="breadcrumb" aria-label="breadcrumbs">
       <ol>