ci: Omnix not needed

Author: srid

.github/workflows/ci.yaml

@@ -13,9 +13,6 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install Nix
         uses: nixbuild/nix-quick-install-action@v33
-      - name: Install Omnix
-        run: |
-          nix profile install nixpkgs#omnix
       - name: Docs for flake.parts
         run: |
           # TODO: Define this in Vira or make it part of our flake?
@@ -28,9 +25,6 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install Nix
         uses: nixbuild/nix-quick-install-action@v33
-      - name: Install Omnix
-        run: |
-          nix profile install nixpkgs#omnix
       - name: Docs static site
         id: docs
         run: |