ci: remove Commitlint workflow (replaced by semantic-pull-request)

.github/workflows/commitlint.yml

@@ -1,21 +0,0 @@
-name: Commit
-
-on:
-  push:
-    branches: [main, features]
-  pull_request:
-    branches: [main, features]
-
-jobs:
-  commitlint:
-    name: Message validation
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        fetch-depth: 0
-    - uses: wagoid/commitlint-github-action@v2
-      with:
-        helpURL: 'https://github.com/Kosmorro/kosmorro/blob/master/CONTRIBUTING.md#commiting'
-