MAINT: add Read the Docs configuration (#122)

.cspell.json

@@ -22,6 +22,7 @@
     ".gitpod.*",
     ".pre-commit-config.yaml",
     ".prettierignore",
+    ".readthedocs.yml",
     ".vscode/*",
     ".vscode/.gitignore",
     "codecov.yml",

.github/release-drafter.yml

@@ -32,6 +32,8 @@ replacers:
 sort-direction: ascending
 
 template: |
+  _See all documentation for this version [here](https://ampform-dpd.rtfd.io/en/$NEXT_PATCH_VERSION)._
+
   $CHANGES
 
   _The full changelog as commits can be found [here](https://github.com/ComPWA/ampform-dpd/compare/$PREVIOUS_TAG...$NEXT_PATCH_VERSION)._

.readthedocs.yml

@@ -0,0 +1,21 @@
+version: 2
+
+sphinx:
+  builder: dirhtml
+  configuration: docs/conf.py
+  fail_on_warning: true
+
+formats:
+  - htmlzip
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.9"
+  apt_packages:
+    - graphviz
+  jobs:
+    post_install:
+      - curl -LsSf https://astral.sh/uv/install.sh | sh
+      - |-
+        /home/docs/.cargo/bin/uv pip install --system -c .constraints/py3.9.txt -e .[doc]