remove microgit (unmaintained since 2020) (#3708)

- ref. #3558

README.md

@@ -1897,7 +1897,6 @@ _See also: [awesome-sysadmin/Code Review](https://github.com/awesome-foss/awesom
 - [Lavagna](https://lavagna.io) - Lavagna is an open-source issue/project management tool designed for small teams. Lightweight, pure Java, easy to install, easy to use. ([Source Code](https://github.com/digitalfondue/lavagna)) `GPL-3.0` `Java`
 - [Lazylead](https://lazylead.org) `⚠` - Eliminate the annoying work within ticketing systems (Jira, GitHub, Trello). Allows to automate daily actions like tickets fields verification, email notifications by JQL/GQL, meeting requests to your (or teammates) calendar. ([Source Code](https://github.com/dgroup/lazylead)) `MIT` `Ruby`
 - [Leantime](https://leantime.io) - Leantime is a lean project management system for small teams and startups helping to manage projects from ideation through delivery. ([Source Code](https://github.com/leantime/leantime)) `GPL-2.0` `PHP`
-- [Microgit](https://github.com/microgit-com/microgit) - Git hosting service made in Crystal and Lucky. `MIT` `Crystal`
 - [Mindwendel](https://www.mindwendel.com/) - Brainstorm and upvote ideas and thoughts within your team. ([Demo](https://www.mindwendel.com), [Source Code](https://github.com/mindwendel/mindwendel)) `AGPL-3.0` `Docker/Elixir`
 - [Octobox](https://octobox.io/) `⚠` - Take back control of your GitHub Notifications. ([Source Code](https://github.com/octobox/octobox)) `AGPL-3.0` `Ruby`
 - [OneDev](https://onedev.io/) - All-In-One DevOps Platform. With Git Management, Issue Tracking, and CI/CD. Simple yet Powerful. ([Source Code](https://code.onedev.io/projects/160)) `MIT` `Java`