chore: remove .github directory

.github/workflows/flakehub-publish-tagged.yml

@@ -1,27 +0,0 @@
-name: "Publish tags to FlakeHub"
-on:
-  push:
-    tags:
-      - "v?[0-9]+.[0-9]+.[0-9]+*"
-  workflow_dispatch:
-    inputs:
-      tag:
-        description: "The existing tag to publish to FlakeHub"
-        type: "string"
-        required: true
-jobs:
-  flakehub-publish:
-    runs-on: "ubuntu-latest"
-    permissions:
-      id-token: "write"
-      contents: "read"
-    steps:
-      - uses: "actions/checkout@v3"
-        with:
-          ref: "${{ (inputs.tag != null) && format('refs/tags/{0}', inputs.tag) || '' }}"
-      - uses: "DeterminateSystems/nix-installer-action@main"
-      - uses: "DeterminateSystems/flakehub-push@main"
-        with:
-          visibility: "public"
-          name: "snowfallorg/lib"
-          tag: "${{ inputs.tag }}"