Update link to Solr

Solr has become a Apache Software Foundation Top Level Project (TLP) on 17 February 2021.
This means it moved from being a sub of lucene http://lucene.apache.org/solr/  to a new website.
See https://web.archive.org/web/20210424020503/https://solr.apache.org/news.html#apache-solr-becomes-an-apache-tlp
Dieser Commit ist enthalten in:
Marc Samendinger 2021-06-21 20:55:52 +02:00 committet von GitHub
Ursprung f011af297c
Commit 932887c4e0
Es konnte kein GPG-SchlĂĽssel zu dieser Signatur gefunden werden
GPG-SchlĂĽssel-ID: 4AEE18F83AFDEB23

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@ -78,7 +78,7 @@ Each container represents a single application.
- [Redis](https://redis.io/) - [Redis](https://redis.io/)
- [Rspamd](https://www.rspamd.com/) - [Rspamd](https://www.rspamd.com/)
- [SOGo](https://sogo.nu/) - [SOGo](https://sogo.nu/)
- [Solr](http://lucene.apache.org/solr/) (optional) - [Solr](https://solr.apache.org/) (optional)
- [Unbound](https://unbound.net/) - [Unbound](https://unbound.net/)
- A Watchdog to provide basic monitoring - A Watchdog to provide basic monitoring