cleanup: removed setup-luau workflow

This was a previous attempt at re-usability that didn't exactly pan out well

.github/workflows/setup-luau.yml

@@ -1,28 +0,0 @@
-name: Setup Luau
-
-on:
-  workflow_call:
-    inputs:
-      runsOn:
-        required: true
-        type: string
-
-jobs:
-  setup-luau:
-    name: Setup Luau
-    runs-on: ${{ inputs.runsOn }}
-    steps:
-      - uses: actions/checkout@v3
-
-      - name: Build Luau
-        run: make config=release luau luau-analyze
-
-      - uses: actions/setup-python@v3
-        with:
-          python-version: "3.9"
-          architecture: "x64"
-
-      - name: Install python dependencies
-        run: |
-          python -m pip install requests
-          python -m pip install --user numpy scipy matplotlib ipython jupyter pandas sympy nose