Remove unused `release-drafter` files (#28)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

.github/release-drafter.yml

@@ -1,29 +0,0 @@
-name-template: 'v$NEXT_MINOR_VERSION'
-tag-template: 'v$NEXT_MINOR_VERSION'
-prerelease: true
-exclude-labels:
-  - 'skip-changelog'
-categories:
-  - title: '🚀 Features'
-    labels:
-      - 'new-feature'
-      - 'feature'
-      - 'enhancement'
-  - title: '🐛 Bug fixes'
-    labels:
-      - 'fix'
-      - 'bugfix'
-      - 'bug'
-  - title: '📖 Docs'
-    labels:
-      - 'docs'
-  - title: '📦 Dependencies'
-    labels:
-      - 'dependencies'
-  - title: '🧰 Maintenance'
-    label: 'chore'
-change-template: '- #$NUMBER: $TITLE'
-template: |
-  ## Changes
-
-  $CHANGES

.github/workflows/release-notes.yml

@@ -1,14 +0,0 @@
-name: Release notes
-
-on:
-  push:
-    branches:
-      - master
-
-jobs:
-  update_release_draft:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: release-drafter/release-drafter@v5
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}