actually add GHA

.Rbuildignore

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+^\.github$

.github/.gitignore

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+*.html

.github/workflows/render-rmd.yaml

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+name: render
+on:
+  push:
+    branches: main
+permissions:
+  contents: write
+jobs:
+  render:
+    runs-on: ubuntu-latest
+    steps:
+      # Checkout this repo
+      - uses: actions/checkout@v4
+
+      # Install R
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
+
+      # Install R packages
+      - uses: r-lib/actions/setup-r-dependencies@v2
+
+      # Install pandoc
+      - uses: r-lib/actions/setup-pandoc@v2
+
+      # Render the rmarkdown file into rmd/
+      - name: Render Rmarkdown
+        shell: Rscript {0}
+        run: rmarkdown::render("index.Rmd", output_dir = "rmd")
+
+      # Publish rmd/ to GitHub pages
+      - name: Publish to GitHub pages 🚀
+        uses: JamesIves/[email protected]
+        with:
+          folder: rmd