Add uploading from documentation option. (#1048)

This allows for directly uploading OMG to ESP32 and ESp8266 devices from the upload section of the documentation.

This will upload the latest release binary for the device selected in the dropdown menu on the webpage.

A script has been added to generate the upload page when a new release is issued.

.github/workflows/manual_docs.yml

@@ -0,0 +1,34 @@
+name: Create and publish documentation
+on:
+  workflow_dispatch:
+jobs:
+  documentation:
+    runs-on: ubuntu-latest
+    name: Create the documentation and deploy it to GitHub Pages
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: "14.x"
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.7"
+      - name: Install build dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install requests
+          npm install
+      - name: Set version tag from git
+        run: sed -i "s/version_tag/${GITHUB_REF#refs/tags/}/g" docs/.vuepress/config.js
+      - name: Build documentation
+        run: |
+          python ./scripts/gen_wu.py ${GITHUB_REPOSITORY}
+          npm run docs:build
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./docs/.vuepress/dist
+          cname: docs.openmqttgateway.com