Update to Swift 6

.github/workflows/docs.yml

@@ -18,7 +18,7 @@ jobs:
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: macos-14
+    runs-on: macos-15
     steps:
       - uses: actions/checkout@v4
       - name: Build Docs

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.9
+// swift-tools-version: 6.0
 //
 //  Package.swift
 //  TermKitBackend
@@ -31,5 +31,6 @@ let package = Package(
             name: "TestApp",
             dependencies: ["TermKitBackend"]
         )
-    ]
+    ],
+    swiftLanguageModes: [.v5]
 )

Sources/TermKitBackend/TermKitBackend.docc/theme-settings.json

@@ -11,7 +11,6 @@
             "button-text": "#ffffff",
             "header": "#7f313b",
             "documentation-intro-accent": "var(--color-header)",
-            "documentation-intro-fill": "radial-gradient(circle at top, var(--color-header) 30%, #000 100%)",
             "link": "#ea3358",
             "nav-link-color": "#ea3358",
             "nav-dark-link-color": "#ea3358",