Remove test images as a submodule

They were causing problems for users without LFS installed, and unnecessary except for tests

.github/workflows/python-package.yml

@@ -19,7 +19,6 @@ jobs:
           # Whether to checkout submodules: `true` to checkout submodules or `recursive` to
           # recursively checkout submodules.
           submodules: 'true'
-          lfs: 'true'
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
@@ -42,6 +41,9 @@ jobs:
           python -m pip install --upgrade pip
           python -m pip install flake8 ninja setuptools-scm Pillow click nose parameterized
 
+      - name: Install test images
+        run: git clone https://git.pileof.rocks/drewcassidy/quicktex-test-images.git tests/images
+
       - name: Lint with flake8
         run: |
           # stop the build if there are Python syntax errors or undefined names
@@ -58,7 +60,7 @@ jobs:
   build:
     needs: test
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
-    
+
     runs-on: ${{ matrix.os }}
     env:
       MACOSX_DEPLOYMENT_TARGET: 10.15