Migrate from Travis to GitHub Actions

Author: kroenlein

.github/actions/initialize/action.yml

@@ -0,0 +1,13 @@
+name: 'Initialize'
+description: 'Checkout repo and install dependencies'
+runs:
+  using: "composite"
+  steps:
+    - name: Check out repository code
+      uses: actions/checkout@v4
+    - name: Upgrade pip
+      run: python -m pip install --upgrade pip
+      shell: bash
+    - name: Install documentation building framework
+      run: pip install mkdocs
+      shell: bash

.github/workflows/deploy-docs.yml

@@ -0,0 +1,19 @@
+name: PR Checks
+
+on:
+  pull_request:
+    branches:
+      - main
+      - master
+
+jobs:
+  check-docs:
+    name: Check docs for warnings
+    runs-on: ubuntu-latest
+    steps:
+      - name: Initialize the environment
+        uses: CitrineInformatics/common-gh-actions/.github/actions/initialize@v1
+        with:
+          documentation: 'true'
+      - name: Build Docs
+        run: mkdocs build --strict --verbose

.github/workflows/repo-checks.yml

@@ -9,7 +9,8 @@ We have adopted the following style guidelines:
 
 ## Deploying docs to Github Pages Site
 
-We're currently using TravisCI to deploy to Github Pages. To update the GH_SECRET_TOKEN environment variable referenced in the `.travis.yml` file, follow the [TravisCI documentation](https://docs.travis-ci.com/user/deployment/pages/). Only master docs can be deployed to the documentation site.
+We're currently using GitHub Actions to deploy to Github Pages.
+The docs on the master branch are automatically deployed to the documentation site.
 
 ## Building the Docs Locally
 

.travis.yml

@@ -8,4 +8,4 @@ markdown_extensions:
         permalink: True
 
 extra:
-    version: 0.1
+    version: 0.2