Update CI job and task names.

.github/workflows/ci.yml

@@ -3,8 +3,8 @@ on:
   pull_request:
 
 jobs:
-  check-links:
-    name: Check links
+  build:
+    name: Build site
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
@@ -17,7 +17,7 @@ jobs:
         pip install --upgrade pip
         pip install --upgrade setuptools
         pip install lektor pygments
-    - name: Check links
+    - name: Build site
       run: |
         lektor plugins reinstall
         lektor build --no-prune