Deploy docs with GHA instead of RTD.

.github/workflows/deploy-docs.yml

@@ -0,0 +1,77 @@
+name: Deploy docs
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{
+    github.event_name == 'pull_request'
+    && format('pr-{0}', github.event.number)
+    || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            cmake g++ pkg-config \
+            zlib1g-dev libeigen3-dev libzip-dev \
+            ninja-build doxygen
+
+      - name: Install Python dependencies
+        run: python3 -m pip install -r docs/requirements.txt
+
+      - name: Build docs
+        run: |
+          cmake -S . -B build -DTRX_BUILD_DOCS=ON
+          cmake --build build --target docs
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          name: ${{ github.event_name == 'pull_request'
+            && format('github-pages-preview-{0}', github.event.number)
+            || 'github-pages' }}
+          path: docs/_build/html
+
+  deploy:
+    if: github.event_name != 'pull_request'
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4
+
+  deploy-preview:
+    if: github.event_name == 'pull_request'
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages-preview-${{ github.event.number }}
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy PR preview
+        id: deployment
+        uses: actions/deploy-pages@v4
+        with:
+          preview: true
+          artifact_name: github-pages-preview-${{ github.event.number }}

README.md

@@ -1,6 +1,6 @@
 # TRX-cpp
 
-[![Documentation](https://readthedocs.org/projects/trx-cpp/badge/?version=latest)](https://trx-cpp.readthedocs.io/en/latest/)
+[![Docs](https://img.shields.io/badge/docs-github.io-blue?style=flat&logo=github)](https://tee-ar-ex.github.io/trx-cpp/)
 [![codecov](https://codecov.io/gh/tee-ar-ex/trx-cpp/branch/main/graph/badge.svg)](https://codecov.io/gh/tee-ar-ex/trx-cpp)
 
 A C++17 library for reading, writing, and memory-mapping the [TRX tractography format](https://github.com/tee-ar-ex/trx-spec) — efficient storage for large-scale tractography data.
@@ -39,11 +39,11 @@ auto positions = trx.positions.as_matrix<float>(); // (NB_VERTICES, 3)
 trx.close();
 ```
 
-See [Building](https://trx-cpp.readthedocs.io/en/latest/building.html) for platform-specific dependency installation and [Quick Start](https://trx-cpp.readthedocs.io/en/latest/quick_start.html) for a complete first program.
+See [Building](https://tee-ar-ex.github.io/trx-cpp/building.html) for platform-specific dependency installation and [Quick Start](https://tee-ar-ex.github.io/trx-cpp/quick_start.html) for a complete first program.
 
 ## Documentation
 
-Full documentation is at **[trx-cpp.readthedocs.io](https://trx-cpp.readthedocs.io/en/latest/)**.
+Full documentation is at **[tee-ar-ex.github.io/trx-cpp](https://tee-ar-ex.github.io/trx-cpp/)**.
 
 ## Third-party notices
 

docs/index.md

@@ -1,8 +1,8 @@
 # TRX-cpp Documentation
 
-```{image} https://readthedocs.org/projects/trx-cpp/badge/?version=latest
+```{image} https://img.shields.io/badge/docs-github.io-blue?style=flat&logo=github
 :alt: Documentation Status
-:target: https://trx-cpp.readthedocs.io/en/latest/
+:target: https://tee-ar-ex.github.io/trx-cpp/
 ```
 
 ```{image} https://codecov.io/gh/tee-ar-ex/trx-cpp/branch/main/graph/badge.svg