Fix pkgdown config: replace removed get_mnar_peptides with compute_dataset_mnar

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: danmaclean

_pkgdown.yml

@@ -72,7 +72,7 @@ reference:
   desc: Functions for handling missing data
   contents:
   - compute_missingness
-  - get_mnar_peptides
+  - compute_dataset_mnar
 
 - title: Statistical Tests
   desc: Test functions used in power simulations