update gitblit homepage link

- ref. https://github.com/awesome-selfhosted/awesome-selfhosted/issues/2266

README.md

@@ -1850,7 +1850,7 @@ _See also: [awesome-sysadmin/Code Review](https://github.com/awesome-foss/awesom
 - [Cgit](https://git.zx2c4.com/cgit/about/) - A fast lightweight web interface for git repositories. ([Source Code](https://git.zx2c4.com/cgit/tree/)) `GPL-2.0` `C`
 - [Fossil](https://www.fossil-scm.org/index.html/doc/trunk/www/index.wiki) - Distributed version control system featuring wiki and bug tracker. `BSD-2-Clause-FreeBSD` `C`
 - [Gerrit](https://www.gerritcodereview.com/) - A code review and project management tool for Git based projects. ([Source Code](https://github.com/GerritCodeReview/gerrit)) `Apache-2.0` `Java/Docker`
-- [Gitblit](https://gitblit.github.io/gitblit/) - Pure Java stack for managing, viewing, and serving Git repositories. ([Source Code](https://github.com/gitblit/gitblit)) `Apache-2.0` `Java`
+- [Gitblit](https://www.gitblit.com/) - Pure Java stack for managing, viewing, and serving Git repositories. ([Source Code](https://github.com/gitblit/gitblit)) `Apache-2.0` `Java`
 - [gitbucket](https://gitbucket.github.io/gitbucket-news/) - Easily installable GitHub clone powered by Scala. ([Source Code](https://github.com/gitbucket/gitbucket)) `Apache-2.0` `Scala/Java`
 - [Gitea](https://gitea.io) - Community managed fork of Gogs, lightweight code hosting solution. ([Demo](https://try.gitea.io), [Source Code](https://github.com/go-gitea/gitea)) `MIT` `Go`
 - [GitLab](https://about.gitlab.com) - Self Hosted Git repository management, code reviews, issue tracking, activity feeds and wikis. ([Demo](https://gitlab.com/), [Source Code](https://gitlab.com/gitlab-org/gitlab-foss)) `MIT` `Ruby`