remove Moonmoon (unmaintained since 2018) (#3724)

- only supports EOL PHP versions https://github.com/moonmoon/moonmoon/issues/117
- ref. https://github.com/awesome-selfhosted/awesome-selfhosted/issues/3558
- WARNING:awesome_lint.py: Moonmoon: last updated -1617 days, 4:04:51.307478 ago, older than 365 days

README.md

@@ -876,7 +876,6 @@ A [news aggregator](https://en.wikipedia.org/wiki/News_aggregator), also termed
 - [Kriss Feed](https://github.com/tontof/kriss_feed) - Simple and smart (or stupid) feed reader. `CC0-1.0` `PHP`
 - [Leed](https://github.com/LeedRSS/Leed) - Leed (for Light Feed) is a Free and minimalist RSS aggregator. `AGPL-3.0` `PHP`
 - [Miniflux](https://miniflux.app/) - Miniflux is a minimalist and open source news reader, written in Go and PostgreSQL. ([Source Code](https://github.com/miniflux/v2)) `Apache-2.0` `Go`
-- [Moonmoon](https://moonmoon.org/) - Simple feed aggregator (planet like): it only aggregates feeds and spits them out in one single page. ([Source Code](https://github.com/moonmoon/moonmoon)) `BSD-3-Clause` `PHP`
 - [NewsBlur](https://www.newsblur.com/) - NewsBlur is a personal news reader that brings people together to talk about the world. A new sound of an old instrument. ([Source Code](https://github.com/samuelclay/NewsBlur)) `MIT` `Python`
 - [newsdash](https://github.com/buzz/newsdash) - A news dashboard inspired by iGoogle and Netvibes. `AGPL-3.0` `Nodejs`
 - [Newspipe](https://git.sr.ht/~cedric/newspipe) - Newspipe is a web news reader. ([Demo](https://www.newspipe.org/signup)) `AGPL-3.0` `Python`