chore: Switch DocTOC build to GitHub Actions

Only executes when the TOC files have changed.
Now also checks BestPractices.md

.github/workflows/doctoc.yml

@@ -0,0 +1,27 @@
+name: Check generated TOCs
+
+on:
+  pull_request:
+    paths:
+      - "README.md"
+      - "docs/BestPractices.md"
+
+jobs:
+  doctoc:
+    name: Doc TOC Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '12.x'
+      - name: Install doctoc
+        run: npm i -g doctoc
+      - name: Create README copy and diff with doctoc
+        run: cp README.md README.md.tmp &&
+          doctoc --title='## Table of Contents' --github README.md &&
+          diff -q README.md README.md.tmp
+      - name: Create "docs/BestPractices.md" copy and diff with doctoc
+        run: cp docs/BestPractices.md docs/BestPractices.md.tmp &&
+          doctoc --title='## Table of Contents' --github docs/BestPractices.md &&
+          diff -q docs/BestPractices.md docs/BestPractices.md.tmp

.travis.yml

@@ -57,17 +57,6 @@ jobs:
       script:
         - find . -name "*.md" | xargs -n 1 markdown-link-check
 
-    - stage: Test
-      name: Doc Toc Check
-      language: node_js
-      node_js:
-        - lts/*
-      install: npm i -g doctoc
-      script:
-        - cp README.md README.md.tmp &&
-          doctoc --title='## Table of Contents' --github README.md &&
-          diff -q README.md README.md.tmp
-
     - stage: Test
       name: shfmt check
       script:

travis.yml.template

@@ -55,17 +55,6 @@ jobs:
       script:
         - find . -name "*.md" | xargs -n 1 markdown-link-check
 
-    - stage: Test
-      name: Doc Toc Check
-      language: node_js
-      node_js:
-        - lts/*
-      install: npm i -g doctoc
-      script:
-        - cp README.md README.md.tmp &&
-          doctoc --title='## Table of Contents' --github README.md &&
-          diff -q README.md README.md.tmp
-
     - stage: Test
       name: shfmt check
       script: