Added GitHub Actions for the docs generation

Author: andrey-helldar

.github/workflows/changelog.yml

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+name: changelog
+
+on:
+    release:
+        types:
+            - released
+
+permissions: write-all
+
+jobs:
+    update:
+        runs-on: ubuntu-latest
+
+        steps:
+            -   name: Checkout code
+                uses: actions/checkout@v3
+
+            -   name: Setup PHP
+                uses: shivammathur/setup-php@v2
+                with:
+                    extensions: curl, mbstring, zip, pcntl, pdo, pdo_sqlite, iconv, json
+                    coverage: none
+
+            -   name: Git setup
+                if: success()
+                run: |
+                    git config --local user.email "action@github.com"
+                    git config --local user.name "GitHub Action"
+
+            -   name: Update
+                uses: stefanzweifel/changelog-updater-action@v1
+                if: success()
+                with:
+                    release-date: ${{ steps.release_date.outputs.date }}
+                    release-notes: ${{ github.event.release.body }}
+                    latest-version: ${{ github.event.release.tag_name }}
+                    compare-url-target-revision: ${{ github.event.release.target_commitish }}
+                    path-to-changelog: docs/prologue/changelog/3.x.md
+
+            -   name: Storing
+                id: changelog
+                if: success()
+                run: |
+                    IS_DIRTY=1
+
+                    { git add . && git commit -a -m "🧾 Update CHANGELOG"; } || IS_DIRTY=0
+
+                    echo ::set-output name=is_dirty::${IS_DIRTY}
+
+            -   name: Push changes
+                uses: ad-m/github-push-action@master
+                if: success() && steps.changelog.outputs.is_dirty == 1
+                with:
+                    github_token: ${{ secrets.COMPOSER_TOKEN }}

.github/workflows/docs.yml

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+name: docs
+
+on:
+    push:
+    workflow_run:
+        workflows:
+            - changelog
+        types:
+            - completed
+    workflow_dispatch:
+
+permissions: write-all
+
+jobs:
+    generate:
+        runs-on: ubuntu-latest
+
+        steps:
+            -   uses: actions/checkout@v3
+                with:
+                    fetch-depth: 0
+                    token: ${{ secrets.GITHUB_TOKEN }}
+
+            -   name: Setup Node.js
+                uses: actions/setup-node@v3
+
+            -   name: Cache dependencies
+                uses: actions/cache@v3
+                id: npm-cache
+                with:
+                    path: |
+                        **/node_modules
+                    key: ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}
+                    restore-keys: |
+                        ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}
+
+            -   name: Install dependencies
+                run: npm i
+
+            -   name: Build VuePress site
+                run: npm run build
+
+            -   name: Deploy to GitHub Pages
+                uses: crazy-max/ghaction-github-pages@v3.0.0
+                with:
+                    target_branch: gh-pages
+                    build_dir: docs/.vuepress/dist
+                env:
+                    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}