feat: add the first two talks, built with Marp and published on GitHub Pages

.github/workflows/ci.yml

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+# SPDX-FileCopyrightText: 2026 Anton Wiklund and Solid Memo contributors
+#
+# SPDX-License-Identifier: MIT
+
+name: CI
+
+# Every change is checked before it is merged: a pull request, from this
+# repository or a fork, runs the checks and builds every talk. A push to
+# main does the same, then publishes the talks on GitHub Pages
+# (README.md#publishing).
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+# What every job may read. Only deploy may write to GitHub Pages, and
+# says so: a job's permissions replace these.
+permissions:
+  contents: read
+
+# A newer push to a pull request replaces its run still going. On main,
+# runs queue instead, so that a deploy is never cut off halfway.
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+jobs:
+  # Every file states its copyright and license (`reuse lint`), and the
+  # workflows are checked (actionlint, zizmor), with the linters from
+  # PyPI, pinned in scripts/requirements-lint.txt.
+  lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
+        with:
+          python-version: "3.15"
+          cache: pip
+          cache-dependency-path: scripts/requirements-lint.txt
+      # pip installs outside the checkout, so only the repository's own
+      # files are there to check.
+      - run: pip install -r scripts/requirements-lint.txt
+      - run: npm run lint:reuse
+      - run: npm run lint:workflows
+
+  # The slides' notes and pictures (npm run check:slides), then every
+  # talk built as a web page, a PDF and a PowerPoint file (npm run build).
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
+        with:
+          node-version-file: .nvmrc
+          cache: npm
+      - run: npm ci
+      # The PDF and the PowerPoint file are drawn in the runner's own
+      # Google Chrome, so no browser is downloaded.
+      - run: npm run check
+        env:
+          CHROME_PATH: /usr/bin/google-chrome
+      - if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9 # v5.0.0
+        with:
+          path: dist
+
+  # The talks, published on GitHub Pages, from main only.
+  deploy:
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    needs: [lint, build]
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    # To deploy the artifact to GitHub Pages, which proves the run is this
+    # workflow's with an OIDC token.
+    permissions:
+      pages: write
+      id-token: write
+    concurrency:
+      group: pages
+      cancel-in-progress: false
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@368f82528645a54fb793d4d04e342629a3f51346 # v5.0.1

.gitignore

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+# SPDX-FileCopyrightText: 2026 Anton Wiklund and Solid Memo contributors
+#
+# SPDX-License-Identifier: MIT
+
+node_modules/
+dist/
+__pycache__/

.marprc.yml

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+# SPDX-FileCopyrightText: 2026 Anton Wiklund and Solid Memo contributors
+#
+# SPDX-License-Identifier: MIT
+
+# Marp's settings for every talk (https://github.com/marp-team/marp-cli#configuration-file).
+# The themes are in themes/, which npm run build gives Marp with their
+# fonts embedded; a talk names one with `theme:` in its front matter.
+options:
+  # HTML in the slides is limited to a few elements and the class
+  # attribute, for the layouts the themes give (columns, a figure beside
+  # text): anything else is shown as text, not run.
+  html:
+    div: [class]
+    span: [class]
+    br: []

.nvmrc

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+24