ci: remove flakehub, flakestry publish

No one uses (or should use) either of these really, we're probably one
of the most interesting programs on that site anyways, let's not give
free legitimacy to something like that.

Signed-off-by: Christina Sørensen <christina@cafkafk.com>

.github/workflows/publish-flake.yml

@@ -1,42 +0,0 @@
-# SPDX-FileCopyrightText: 2024 Christina Sørensen
-# SPDX-License-Identifier: EUPL-1.2
-#
-# SPDX-FileCopyrightText: 2023-2024 Christina Sørensen, eza contributors
-# SPDX-FileCopyrightText: 2014 Benjamin Sago
-# SPDX-License-Identifier: MIT
-name: "Publish flake"
-on:
-  push:
-    tags:
-      - "v?[0-9]+.[0-9]+.[0-9]+"
-      - "v?[0-9]+.[0-9]+.[0-9]+*"
-  workflow_dispatch:
-    inputs:
-      tag:
-        description: "Existing tag to publish"
-        type: "string"
-        required: true
-jobs:
-  publish-flakestry:
-    name: "Publish to `flakestry.dev`"
-    runs-on: ubuntu-latest
-    permissions:
-      id-token: "write"
-      contents: "read"
-    steps:
-      - uses: flakestry/flakestry-publish@main
-        with:
-          version: "${{ inputs.tag || github.ref_name }}"
-  publish-flakehub:
-    name: "Publish to `flakehub.com`"
-    runs-on: ubuntu-latest
-    permissions:
-      id-token: "write"
-      contents: "read"
-    steps:
-      - uses: "actions/checkout@v4"
-      - uses: "DeterminateSystems/nix-installer-action@main"
-      - uses: "DeterminateSystems/flakehub-push@main"
-        with:
-          visibility: "public"
-          tag: "${{ inputs.tag || github.ref_name }}"