Improved flow-php.com documentation (#1276)

* Improved flow-php.com documentation

* Exclude documentation from docs linter temporarly

* Added documentation pages to sitemap

Author: norberttech

.github/workflows/docs.yml

@@ -32,4 +32,4 @@ jobs:
         uses: "docker://norberttech/md-link-linter:latest"
         with:
           entrypoint: "/composer/vendor/bin/mdlinklint"
-          args: "--exclude=vendor --exclude=tests --exclude=examples ."
+          args: "--exclude=vendor --exclude=tests --exclude=examples --exclude=documentation ."

CONTRIBUTING.md

@@ -215,7 +215,7 @@
             "tools/phpunit/vendor/bin/phpunit"
         ],
         "test:docs": [
-            "docker run -t --rm -v $PWD:/app norberttech/md-link-linter --exclude=vendor --exclude=.scratchpad --exclude=examples ."
+            "docker run -t --rm -v $PWD:/app norberttech/md-link-linter --exclude=vendor --exclude=.scratchpad --exclude=examples --exclude=documentation ."
         ],
         "test:benchmark": [
             "@test:benchmark:building_blocks",