docs: update README.md gptengineer.app -> lovable.dev (#50)

* docs: update README.md gptengineer.app -> lovable.dev

* Update README.md

Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>

---------

Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>

Author: 0xbrayo

README.md

@@ -2,7 +2,7 @@
 
 [![CI](https://github.com/gptme/gptme-webui/actions/workflows/ci.yml/badge.svg)](https://github.com/gptme/gptme-webui/actions/workflows/ci.yml)
 
-A fancy web UI for [gptme][gptme], built with [gptengineer.app][gptengineer.app].
+A fancy web UI for [gptme][gptme], built with [lovable.dev](https://lovable.dev).
 
 An alternative to the minimal UI currently provided by `gptme`.