remove Realms wiki (no updates since 2018, website down, no activity on bug tracker)

README.md

@@ -1438,7 +1438,6 @@ See also [Documentation Generators](#documentation-generators), [Wikimatrix](htt
 - [PineDocs](https://github.com/xy2z/PineDocs) - Simple, fast, customizable and lightweight site for browsing files. `GPL-3.0` `PHP`
 - [PmWiki](http://www.pmwiki.org) - Wiki-based system for collaborative creation and maintenance of websites. `GPL-3.0` `PHP`
 - [Raneto](http://raneto.com/) - Raneto is an open source Knowledgebase platform that uses static Markdown files to power your Knowledgebase. `MIT` `Nodejs`
-- [Realms](http://realms.io/) - Git-backed wiki inspired by Gollum. ([Source Code](https://github.com/scragg0x/realms-wiki)) `GPL-2.0` `Python`
 - [TiddlyWiki](http://tiddlywiki.com/) - Reusable non-linear personal web notebook. ([Source Code](https://github.com/Jermolene/TiddlyWiki5)) `BSD-3-Clause` `Nodejs`
 - [Tiki](https://tiki.org) - Wiki CMS Groupware with the most built-in features. ([Demo](https://tiki.org/Demo), [Source Code](https://sourceforge.net/p/tikiwiki/code/HEAD/tree/)) `LGPL-2.1` `PHP`
 - [TWiki](http://twiki.org/) - TWiki is a Perl-based structured wiki application, typically used to run a collaboration platform, knowledge or document management system, a knowledge base, or team portal. ([Demo](http://twiki.org/cgi-bin/view/Sandbox/WebHome), [Source Code](http://svn.twiki.org/svn/twiki/)) `GPL-1.0` `Perl`