Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

.github/workflows/coding-standards.yml

@@ -48,7 +48,7 @@ jobs:
         run: "php bin/phpstan analyse --no-progress --error-format=checkstyle | cs2pr"
 
       - name: "Run TwigCS"
-        run: "php bin/twigcs --severity=error --display=blocking --reporter checkstyle app/ src/ | cs2pr"
+        run: "php bin/twigcs --severity=error --display=blocking --reporter checkstyle templates/ | cs2pr"
 
       - name: "Run ergebnis/composer-normalize"
         run: "composer normalize --dry-run --no-check-lock"

.github/workflows/upload-release-package.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           coverage: "none"
           php-version: "${{ matrix.php }}"
-          tools: pecl, composer:2.2
+          tools: pecl
           extensions: pdo, pdo_mysql, pdo_sqlite, pdo_pgsql, curl, imagick, pgsql, gd, tidy
           ini-values: "date.timezone=Europe/Paris"
         env: