docs: pkgdown setup

.github/workflows/pkgdown.yaml

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+# pkgdown workflow of the mlr3 ecosystem v0.1.0
+# https://github.com/mlr-org/actions
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  release:
+    types:
+      - published
+  workflow_dispatch:
+
+name: pkgdown
+
+jobs:
+  pkgdown:
+    runs-on: ubuntu-latest
+
+    concurrency:
+      group: pkgdown-${{ github.event_name != 'pull_request' || github.run_id }}
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: r-lib/actions/setup-pandoc@v2
+
+      - uses: r-lib/actions/setup-r@v2
+
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          extra-packages: any::pkgdown, local::.
+          needs: website
+
+      - name: Install template
+        run: pak::pkg_install("mlr-org/mlr3pkgdowntemplate")
+        shell: Rscript {0}
+
+      - name: Build site
+        run: pkgdown::build_site_github_pages(new_process = FALSE, install = FALSE)
+        shell: Rscript {0}
+
+      - name: Deploy
+        if: github.event_name != 'pull_request'
+        uses: JamesIves/github-pages-deploy-action@v4.6.3
+        with:
+          clean: false
+          branch: gh-pages
+          folder: docs

pkgdown/_pkgdown.yml

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+url: https://mlr3forecast.mlr-org.com
+
+template:
+  bootstrap: 5
+  light-switch: true
+  package: mlr3pkgdowntemplate
+
+development:
+  mode: auto
+  version_label: default
+  version_tooltip: "Version"
+
+toc:
+  depth: 3
+
+navbar:
+  structure:
+    left:  [reference, news, book]
+    right: [github, mattermost, stackoverflow, rss, lightswitch]
+  components:
+    home: ~
+    reference:
+      icon: fa fa-file-alt
+      text: Reference
+      href: reference/index.html
+    mattermost:
+      icon: fa fa-comments
+      href: https://lmmisld-lmu-stats-slds.srv.mwn.de/mlr_invite/
+    github:
+      icon: fa fa-github
+      href: https://github.com/mlr-org/mlr3forecast
+    book:
+      text: mlr3book
+      icon: fa fa-link
+      href: https://mlr3book.mlr-org.com
+    stackoverflow:
+      icon: fab fa-stack-overflow
+      href: https://stackoverflow.com/questions/tagged/mlr3
+    rss:
+      icon: fa-rss
+      href: https://mlr-org.com/