.github/workflows: drop redundant extra_nix_config

Author: zowoq

.github/workflows/flake-updates.yml

@@ -12,9 +12,6 @@ jobs:
       - uses: actions/checkout@v6
       - name: Install Nix
         uses: cachix/install-nix-action@v31
-        with:
-          extra_nix_config: |
-            experimental-features = nix-command flakes
       - name: Update flake.lock
         id: update
         uses: DeterminateSystems/update-flake-lock@v28

.github/workflows/pages.yml

@@ -24,7 +24,6 @@ jobs:
         with:
           extra_nix_config: |
             accept-flake-config = true
-            experimental-features = nix-command flakes
             max-jobs = 0
       - name: Setup Pages
         id: pages