dev: rebase on a less personalized neovim flake

.github/workflows/check.yml

@@ -0,0 +1,17 @@
+name: "Pull request"
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+jobs:
+  nix-flake-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v18
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - run: nix flake check

.github/workflows/manual.yml

@@ -0,0 +1,34 @@
+name: Github Pages docs
+on:
+  push:
+    branches:
+      - main
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: write
+  pages: write
+  id-token: write
+
+# Allow one concurrent deployment
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install Nix
+        uses: cachix/install-nix-action@v18
+      - name: Build
+        run: |
+          nix build '.#docs-html'
+          cp -r result/share/doc/neovim-flake public
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./public