chore: EXT:felogin removed

Not in use: no login form in the content, and no group grants it.
Its TypoScript and the felogin_login content type are gone with it;
the TypoScript of all other keys and the frontend output are unchanged.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

composer.json

@@ -29,7 +29,6 @@
 		"typo3/cms-dashboard": "^13.4",
 		"typo3/cms-extbase": "^13.4",
 		"typo3/cms-extensionmanager": "^13.4",
-		"typo3/cms-felogin": "^13.4",
 		"typo3/cms-filelist": "^13.4",
 		"typo3/cms-fluid": "^13.4",
 		"typo3/cms-fluid-styled-content": "^13.4",