remove Glosa (unmaintained since 2021) (#3701)

- alternatives exist (Isso)
- ref. #3558

README.md

@@ -545,7 +545,6 @@ Simple deployment of [E-mail](https://en.wikipedia.org/wiki/Email) servers, e.g.
 - [Flarum](https://flarum.org) - Delightfully simple forums. Flarum is the next-generation forum software that makes online discussion fun again. ([Source Code](https://github.com/flarum/flarum)) `MIT` `PHP`
 - [FlaskBB](https://flaskbb.org/) - FlaskBB is forum software written in Python using the microframework Flask. You can easily create new topics, posts and send other users private messages. It also includes basic administration and moderation tools. ([Source Code](https://github.com/flaskbb/flaskbb)) `BSD-3-Clause` `Python`
 - [Friendica](https://friendi.ca/) - Social Communication Server. ([Source Code](https://github.com/friendica/friendica)) `AGPL-3.0` `PHP`
-- [Glosa](https://github.com/glosa/glosa-server) - Open source commentary system easy to integrate with static pages. You can import from Disqus. `GPL-3.0` `Java`
 - [GNU social](https://gnu.io/social/) - Social communication software for both public and private communications. ([Source Code](https://notabug.org/diogo/gnu-social)) `AGPL-3.0` `PHP`
 - [GoToSocial](https://github.com/superseriousbusiness/gotosocial) - ActivityPub federated social network server implementing the Mastodon client API. `AGPL-3.0` `Docker/Go`
 - [Hubzilla](https://hubzilla.org) - Decentralized identity, privacy, publishing, sharing, cloud storage, and communications/social platform. ([Source Code](https://framagit.org/hubzilla/core)) `MIT` `PHP`