ci: render T*.qmd tutorial slides in deploy workflow

The render loop matched only L*.qmd, so T01 was never built and
the linked T01 page returned 404. Broaden the glob to [LT]*.qmd.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: d-krupke

.github/workflows/deploy-slides.yml

@@ -24,7 +24,7 @@ jobs:
 
       - name: Render slides
         run: |
-          for qmd in slides/*/L*.qmd; do
+          for qmd in slides/*/[LT]*.qmd; do
             quarto render "$qmd"
           done