Remove Demo from Redmine (#3872)

Co-authored-by: nodiscc <nodiscc@gmail.com>

README.md

@@ -1907,7 +1907,7 @@ _Related: [Ticketing](#ticketing), [Task Management & To-do Lists](#task-managem
 - [Phproject](https://www.phproject.org/) - High performance full-featured project management system. ([Source Code](https://github.com/Alanaktion/phproject)) `GPL-3.0` `PHP`
 - [Plane](https://plane.so) - Open Source JIRA, Linear and Height Alternative. Plane helps you track your issues, epics, and product roadmaps in the simplest way possible. ([Demo](https://app.plane.so), [Source Code](https://github.com/makeplane/plane)) `Apache-2.0` `Docker`
 - [ProjeQtOr](https://www.projeqtor.org/) - A complete, mature, multi-user project management system with extensive functionality for all phases of a project. ([Demo](https://demo.projeqtor.org/), [Source Code](https://sourceforge.net/p/projectorria/code/HEAD/tree/branches/)) `AGPL-3.0` `PHP`
-- [Redmine](https://www.redmine.org/) - Redmine is a flexible project management web application. ([Demo](http://demo.redmine.org/), [Source Code](https://svn.redmine.org/redmine/)) `GPL-2.0` `Ruby`
+- [Redmine](https://www.redmine.org/) - Redmine is a flexible project management web application. ([Source Code](https://svn.redmine.org/redmine/)) `GPL-2.0` `Ruby`
 - [RhodeCode](https://rhodecode.com/) - RhodeCode is an open source platform for software development teams. It unifies and simplifies repository management for Git, Subversion, and Mercurial. ([Source Code](https://code.rhodecode.com/)) `AGPL-3.0` `Python`
 - [Rukovoditel](https://www.rukovoditel.net/) - Configurable open source project management, web-based application. ([Source Code](https://www.rukovoditel.net/download.php)) `GPL-2.0` `PHP`
 - [SCM Manager](https://www.scm-manager.org/) - The easiest way to share and manage your Git, Mercurial and Subversion repositories over http. ([Source Code](https://github.com/scm-manager/scm-manager)) `BSD-3-Clause` `Java`