Remove old project from split

Author: jaapio

config.subsplit-publish.json

@@ -25,11 +25,6 @@
       "directory": "packages/guides-cli",
       "target": "git@github.com:phpDocumentor/guides-cli.git"
     },
-    {
-      "name": "guides-symfony",
-      "directory": "packages/guides-symfony",
-      "target": "git@github.com:phpDocumentor/guides-symfony.git"
-    },
     {
       "name": "guides-theme-bootstrap",
       "directory": "packages/guides-theme-bootstrap",