[TASK] Switch Documentation Rendering to PHP (#870)

* [TASK] Switch Documentation Rendering to PHP

You can try out the rendering locally with
```
make docs
```

* Add export-ignore to Makefile

* Remove Makefile

You can try out the rendering locally with
```
docker run --rm --pull always -v $(pwd):/project -it ghcr.io/typo3-documentation/render-guides:latest --config=Documentation
```

.github/workflows/test-documentation.yml

@@ -0,0 +1,17 @@
+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/Index.rst

@@ -52,4 +52,3 @@ If using Fluid in combination with TYPO3 CMS, a look at the documentation of
    :hidden:
 
    Sitemap
-   genindex

Documentation/guides.xml

@@ -0,0 +1,25 @@
+<?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://packagist.org/packages/typo3fluid/fluid"
+               project-contact="https://typo3.slack.com/archives/C2MGJ7SJX"
+               project-repository="https://github.com/TYPO3/Fluid"
+               project-issues="https://github.com/TYPO3/Fluid/issues"
+               edit-on-github-branch="main"
+               edit-on-github="TYPO3/Fluid"
+               typo3-core-preferred="stable"
+               interlink-shortcode="typo3fluid/fluid"
+    />
+    <project title="Fluid Rendering Engine"
+             release="main (development)"
+             version="main (development)"
+             copyright="since 2009 by the Fluid contributors"
+    />
+    <inventory id="ext_fsc"
+               url="https://docs.typo3.org/c/typo3/cms-fluid-styled-content/main/en-us/"
+    />
+</guides>