[FEATURE] Switch to PHP-based rendering

.github/workflows/documentation.yml

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+name: test documentation
+
+on: [ push, pull_request ]
+
+jobs:
+  tests:
+    name: documentation
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Test if the documentation will render without warnings
+        run: |
+          mkdir -p Documentation-GENERATED-temp \
+          && docker run --rm --pull always -v $(pwd):/project \
+             ghcr.io/typo3-documentation/render-guides:latest --config=Documentation --no-progress --fail-on-log

Documentation/guides.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<guides xmlns="https://www.phpdoc.org/guides" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="https://www.phpdoc.org/guides ../vendor/phpdocumentor/guides-cli/resources/schema/guides.xsd"
+        links-are-relative="true">
+    <extension class="\T3Docs\Typo3DocsTheme\DependencyInjection\Typo3DocsThemeExtension"
+               project-home="https://docs.typo3.org/m/typo3/guide-contributionworkflow/main/en-us/"
+               project-contact="https://typo3.slack.com/archives/C028JEPJL"
+               project-repository="https://github.com/TYPO3-Documentation/TYPO3CMS-Guide-ContributionWorkflow"
+               project-issues="https://github.com/TYPO3-Documentation/TYPO3CMS-Guide-ContributionWorkflow/issues"
+               edit-on-github-branch="main" edit-on-github="TYPO3-Documentation/TYPO3CMS-Guide-ContributionWorkflow"
+               typo3-core-preferred="main"/>
+    <project title="TYPO3 Contribution Guide - Core Development" release="main" version="main"
+             copyright="since 2015 by the TYPO3 contributors"/>
+</guides>

Makefile

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+.PHONY: help
+help: ## Displays this list of targets with descriptions
+	@echo "The following commands are available:\n"
+	@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[32m%-30s\033[0m %s\n", $$1, $$2}'
+
+.PHONY: docs
+docs: ## Generate projects documentation (from "Documentation" directory)
+	mkdir -p Documentation-GENERATED-temp
+
+	docker run --rm --pull always -v "$(shell pwd)":/project -t ghcr.io/typo3-documentation/render-guides:latest --config=Documentation
+
+.PHONY: test-docs
+test-docs: ## Test the documentation rendering
+	mkdir -p Documentation-GENERATED-temp
+
+	docker run --rm --pull always -v "$(shell pwd)":/project -t ghcr.io/typo3-documentation/render-guides:latest --config=Documentation --no-progress --fail-on-log