ci: drop the Go toolchain from Actions and Netlify

Nothing in the repository needs Go any more. Kept as its own commit so a bisect
can attribute a Hugo build break to this change rather than to the engine
deletion.

Node setup and the conditional npm ci stay: the lockfile exists, so the
dependencies the engine now needs are installed if a workflow ever invokes it.

.github/workflows/hugo.yml

@@ -20,7 +20,6 @@ jobs:
     runs-on: ubuntu-latest
     env:
       DART_SASS_VERSION: 1.97.1
-      GO_VERSION: 1.25.5
       HUGO_VERSION: 0.154.0
       NODE_VERSION: 24.12.0
       TZ: Asia/Ho_Chi_Minh
@@ -30,11 +29,6 @@ jobs:
         with:
           submodules: recursive
           fetch-depth: 0
-      - name: Setup Go
-        uses: actions/setup-go@v6
-        with:
-          go-version: ${{ env.GO_VERSION }}
-          cache: false
       - name: Setup Node.js
         uses: actions/setup-node@v6
         with:
@@ -61,7 +55,6 @@ jobs:
       - name: Verify installations
         run: |
           echo "Dart Sass: $(sass --version)"
-          echo "Go: $(go version)"
           echo "Hugo: $(hugo version)"
           echo "Node.js: $(node --version)"
       - name: Install Node.js dependencies

netlify.toml

@@ -1,6 +1,5 @@
 [build.environment]
 DART_SASS_VERSION = "1.97.1"
-GO_VERSION = "1.25.5"
 HUGO_VERSION = "0.154.0"
 NODE_VERSION = "24.12.0"
 TZ = "Asia/Ho_Chi_Minh"