ci: remove useless code (#45)

Author: pythonbrad

.github/workflows/rust.yml

@@ -13,15 +13,10 @@ env:
 jobs:
   build:
     runs-on: ${{matrix.os}}
-    env:
-      DISPLAY: ':99'
     strategy:
       fail-fast: false
       matrix: 
         os: [macos-latest, ubuntu-latest, windows-latest]
-        include:
-        - os: ubuntu-latest
-          headless: Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
 
     steps:
       - uses: actions/checkout@v3
@@ -36,9 +31,6 @@ jobs:
       - name: Add components
         run: rustup component add clippy rustfmt
 
-      - name: Setup headless environment
-        run: ${{matrix.headless}}
-
       - name: Rustfmt
         run: |
           cargo fmt -- --check