Fix markdownlint config for Marp slide decks

Disable rules that conflict with Marp presentation format:
- MD025: Allow multiple h1 headings (each slide has its own h1)
- MD026: Allow ! in headings (e.g. 'Thank you!')
- MD034: Allow bare URLs (Mastodon handles)
- MD060: Allow compact table pipe style

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: codebytes

.github/linters/.markdown-lint.yml

@@ -24,11 +24,14 @@ MD007:
 MD013:
   line_length: 400            # Line length 80 is far too short
 MD024: false                  # Multiple headers with the same content
+MD025: false                  # Multiple h1s (Marp slides use h1 per slide)
 MD026:
-  punctuation: ".,;:!。，；:"  # List of not allowed
+  punctuation: ".,;:。，；:"   # Allow ! in headings (slides use "Thank you!")
 MD029: false                  # Ordered list item prefix
 MD033: false                  # Allow inline HTML
+MD034: false                  # Allow bare URLs (Mastodon handles etc.)
 MD036: false                  # Emphasis used instead of a heading
+MD060: false                  # Table column style (compact pipes in slides)
 
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