[MAINT] add deploy workflow

.github/dependabot.yml

@@ -0,0 +1,9 @@
+---
+# Documentation
+# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+version: 2
+updates:
+- package-ecosystem: github-actions
+  directory: /
+  schedule:
+    interval: monthly

.github/workflows/publishdocs.yaml

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+---
+name: Publish docs via GitHub Pages
+on:
+  push:
+    branches:
+    - main
+
+jobs:
+  build:
+    name: Deploy docs
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout master
+      uses: actions/checkout@v4
+
+    - name: Deploy docs
+      uses: mhausenblas/mkdocs-deploy-gh-pages@master
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/validation.yml

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+---
+name: Validation
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: ['*']
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  # Check for common misspellings
+  codespell:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: codespell-project/actions-codespell@master
+
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: gaurav-nelson/github-action-markdown-link-check@v1