Change from Mkdocs to slates

docs/.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Report a Bug
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Bug Description**
+A clear and concise description of what the bug is and how to reproduce it.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Browser (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Last upstream Slate commit (run `git log --author="\(Robert Lord\)\|\(Matthew Peveler\)\|\(Mike Ralphson\)" | head -n 1`):**
+Put the commit hash here

docs/.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Questions, Ideas, Discussions
+    url: https://github.com/slatedocs/slate/discussions
+    about: Ask and answer questions, and propose new features.

docs/.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+⚠️ 🚨 ⚠️  STOP AND READ THIS ⚠️ 🚨 ⚠️
+
+👆👆 see that 'base fork' dropdown above? You should change it! The default value of "slatedocs/slate" submits your change to ALL USERS OF SLATE, not just your company. This is PROBABLY NOT WHAT YOU WANT.
+-->

docs/.github/workflows/build.yml

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+name: Build
+
+on:
+  push:
+    branches: [ '*' ]
+  pull_request:
+    branches: [ '*' ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        ruby-version: [2.3, 2.4, 2.5, 2.6, 2.7]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+
+    - uses: actions/cache@v2
+      with:
+        path: vendor/bundle
+        key: gems-${{ runner.os }}-${{ matrix.ruby-version }}-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          gems-${{ runner.os }}-${{ matrix.ruby-version }}-
+          gems-${{ runner.os }}-
+
+    # necessary to get ruby 2.3 to work nicely with bundler vendor/bundle cache
+    # can remove once ruby 2.3 is no longer supported
+    - run: gem update --system
+
+    - run: bundle config set deployment 'true'
+    - name: bundle install
+      run: |
+        bundle config path vendor/bundle
+        bundle install --jobs 4 --retry 3
+
+    - run: bundle exec middleman build

docs/.github/workflows/deploy.yml

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+name: Deploy
+
+on:
+  push:
+    branches: [ 'main' ]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    env:
+      ruby-version: 2.5
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ env.ruby-version }}
+
+    - uses: actions/cache@v2
+      with:
+        path: vendor/bundle
+        key: gems-${{ runner.os }}-${{ matrix.ruby-version }}-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          gems-${{ runner.os }}-${{ matrix.ruby-version }}-
+          gems-${{ runner.os }}-
+
+    - run: bundle config set deployment 'true'
+    - name: bundle install
+      run: |
+        bundle config path vendor/bundle
+        bundle install --jobs 4 --retry 3
+
+    - run: bundle exec middleman build
+
+    - name: Deploy
+      uses: peaceiris/actions-gh-pages@v3
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        publish_dir: ./build
+        keep_files: true

docs/.github/workflows/dev_deploy.yml

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+name: Dev Deploy
+
+on:
+  push:
+    branches: [ 'dev' ]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    env:
+      ruby-version: 2.5
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ env.ruby-version }}
+
+    - uses: actions/cache@v2
+      with:
+        path: vendor/bundle
+        key: gems-${{ runner.os }}-${{ matrix.ruby-version }}-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          gems-${{ runner.os }}-${{ matrix.ruby-version }}-
+          gems-${{ runner.os }}-
+
+    - run: bundle config set deployment 'true'
+    - name: bundle install
+      run: |
+        bundle config path vendor/bundle
+        bundle install --jobs 4 --retry 3
+
+    - run: bundle exec middleman build
+
+    - name: Push to Docker Hub
+      uses: docker/build-push-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_ACCESS_KEY }}
+        repository: slatedocs/slate
+        tag_with_ref: true
+
+    - name: Deploy
+      uses: peaceiris/actions-gh-pages@v3.7.0-8
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        destination_dir: dev
+        publish_dir: ./build
+        keep_files: true

docs/.github/workflows/publish.yml

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+name: Publish Docker image
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+
+      - name: Push to Docker Hub
+        uses: docker/build-push-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_ACCESS_KEY }}
+          repository: slatedocs/slate
+          tag_with_ref: true
+          tags: latest