fix: point the Documentation nav item at the wiki

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Changed
+- The **Documentation** navigation item now opens the project wiki rather than the
+  README, so it lands on the user-facing documentation.
 - Migrated the test suites to xUnit v3 on Microsoft Testing Platform, replacing
   the VSTest stack. Development-only; the shipped app is unaffected.
 - Refreshed dependencies to their latest stable releases, including the Windows

src/Snipdeck.Core/ViewModels/ShellViewModel.cs

@@ -19,8 +19,11 @@ public sealed partial class ShellViewModel : ObservableObject
     {
         public const string AllTagsSentinel = "All";
 
-        /// <summary>The project documentation opened by the "Documentation" nav item.</summary>
-        public const string DocumentationUrl = "https://github.com/StuartMeeks/Snipdeck#readme";
+        /// <summary>
+        /// The project documentation opened by the "Documentation" nav item. The wiki
+        /// is the home for user-facing docs; the README is only the project intro.
+        /// </summary>
+        public const string DocumentationUrl = "https://github.com/StuartMeeks/Snipdeck/wiki";
 
         // Glyph for the "All" tag entry (Segoe Fluent Icons "Filter").
         private const string _allTagsGlyph = "\uE71C";

tests/Snipdeck.Core.Tests/ViewModels/ShellViewModelNavTests.cs

@@ -175,14 +175,16 @@ public async Task SelectTag_reapplies_the_snip_list_when_the_same_tag_is_re_invo
         }
 
         [Fact]
-        public async Task OpenDocumentation_opens_the_readme_url()
+        public async Task OpenDocumentation_opens_the_wiki_url()
         {
             var (vm, links, _, _) = await BuildAsync();
 
             await vm.OpenDocumentationAsync();
 
             Assert.Equal(1, links.OpenCount);
-            Assert.Equal(ShellViewModel.DocumentationUrl, links.LastOpenedUrl);
+            // Asserted as a literal, not against the constant: comparing the constant
+            // to itself would pass whatever the nav item actually pointed at.
+            Assert.Equal("https://github.com/StuartMeeks/Snipdeck/wiki", links.LastOpenedUrl);
         }
     }
 }