chore: remove unused file

.github/workflows/jekyll.yml

@@ -1,20 +0,0 @@
-name: Jekyll site CI
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Build the site in the jekyll/builder container
-      run: |
-        docker run \
-        -v ${{ github.workspace }}:/srv/jekyll -v ${{ github.workspace }}/_site:/srv/jekyll/_site \
-        jekyll/builder:latest /bin/bash -c "chmod 777 /srv/jekyll && jekyll build --future"