add typos GH action + config

.github/workflows/typos.yml

@@ -0,0 +1,19 @@
+name: Content typos tests
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check spelling of markdown and JSON files in content directory
+        uses: crate-ci/typos@master
+        with:
+          files: ./content/**/*.{md,json}

typos.toml

@@ -0,0 +1,10 @@
+[default]
+extend-ignore-re = [
+  # don't spellcheck the values of these JSON keys
+  '"(name|videoId|url|instagram)": ".*"',
+
+  # false positives
+  'Jason Sigal',
+  'Thi\.ng',
+  'Shure Lavalier',
+]