Remove old unnecessary sub-directory

.github/workflows/core-build.yml

@@ -0,0 +1,11 @@
+name: core-build
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: azerothcore/reusable-workflows/.github/workflows/core_build_modules.yml@main
+    with:
+      module_repo: ${{ github.event.repository.name }}

.github/workflows/core_codestyle.yml

@@ -0,0 +1,19 @@
+name: Codestyle Checks
+on:
+  push:
+      branches: [ master ]
+  pull_request:
+      branches: [ master ]
+
+jobs:
+  check-codestyle:
+    strategy:
+      fail-fast: false
+
+    runs-on: ubuntu-latest
+    name: Check Codestyling
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Check Codestyling
+        run: source ./apps/ci/ci-codestyle.sh