chore: sync shared config files with org templates

.github/dependabot.yml

@@ -0,0 +1,9 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      actions:
+        patterns: ["*"]

.github/workflows/check-links.yml

@@ -0,0 +1,26 @@
+name: Check links
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+  schedule:
+    - cron: "0 4 1 * *" # monthly, to catch links that break over time
+  workflow_dispatch:
+
+jobs:
+  lychee:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+
+      - name: Check links
+        uses: lycheeverse/lychee-action@v2
+        with:
+          # The book's Markdown pages and notebooks, plus the learner notebooks
+          # in notebooks/ and solutions-NO-PEEKING/.
+          args: --no-progress "./**/*.md" "./**/*.ipynb"
+          fail: true
+        env:
+          # Authenticated requests avoid GitHub rate limits.
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.lycheeignore

@@ -0,0 +1,2 @@
+# Colab's "base_uri" in notebook cell metadata, not a link.
+^https://localhost:8080/$

.pre-commit-config.yaml

@@ -1,2 +1,38 @@
-# no pre-commit
-repos: []
+ci:
+  autoupdate_schedule: monthly
+
+# Don't touch the datasets the lessons read.
+exclude: ^array-oriented-programming/data/
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: check-added-large-files
+      - id: check-case-conflict
+      - id: check-merge-conflict
+      - id: check-symlinks
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+      - id: trailing-whitespace
+
+  - repo: https://github.com/codespell-project/codespell
+    rev: v2.4.3
+    hooks:
+      - id: codespell
+        args:
+          - "-I"
+          - "codespell.txt"
+          # Skip base64 blobs (images in notebook outputs and attachments).
+          - "--ignore-regex"
+          - "[A-Za-z0-9+/]{60,}"
+          # documen.tician.de hosts the PyOpenCL docs.
+          - "--uri-ignore-words-list"
+          - "documen"
+
+  - repo: https://github.com/adamchainz/blacken-docs
+    rev: 1.20.0
+    hooks:
+      - id: blacken-docs
+        additional_dependencies: [black]

array-oriented-programming/1-python.md

@@ -192,7 +192,7 @@ Now `mag3d` can be used in exactly the same ways as `euclidean`, because they're
 mag3d(px, py, pz)
 ```
 
-Python's `is` keyword tells you whether two varible names refer to the same object (as opposed to just being equal to the same value).
+Python's `is` keyword tells you whether two variable names refer to the same object (as opposed to just being equal to the same value).
 
 ```{code-cell} ipython3
 mag3d is euclidean

array-oriented-programming/2-arrays.md

@@ -235,7 +235,7 @@ def array_forces(m, x, p):
     return total_force
 ```
 
-The array-oriented solution is very concise—maybe even "dense"—and it invovles special NumPy functions such as [np.triu_indices](https://numpy.org/doc/stable/reference/generated/numpy.triu_indices.html) for the $n (n - 1) / 2$ combinatorics and [advanced slicing](https://numpy.org/doc/stable/user/basics.indexing.html#advanced-indexing) in square brackets (`[` `]`).
+The array-oriented solution is very concise—maybe even "dense"—and it involves special NumPy functions such as [np.triu_indices](https://numpy.org/doc/stable/reference/generated/numpy.triu_indices.html) for the $n (n - 1) / 2$ combinatorics and [advanced slicing](https://numpy.org/doc/stable/user/basics.indexing.html#advanced-indexing) in square brackets (`[` `]`).
 
 +++
 
@@ -438,7 +438,7 @@ imperative_squares(original)
 ```
 
 ```{code-cell} ipython3
-import dis  # dissasembler; shows us the Python virtual machine instructions
+import dis  # disassembler; shows us the Python virtual machine instructions
 ```
 
 ```{code-cell} ipython3

array-oriented-programming/_config.yml

@@ -1,6 +1,6 @@
 #######################################################################################
 # A default configuration that will be loaded for all jupyter books
-# See the documentation for help and more options: 
+# See the documentation for help and more options:
 # https://jupyterbook.org/customize/config.html
 
 #######################################################################################