Remove Boostnote

Remove Boostnote because it's not ready to be self-hosted.

README.md

@@ -1185,7 +1185,6 @@ _See also: [awesome-sysadmin/IT Asset Management](https://github.com/awesome-fos
 
 _Related: [Wikis](#wikis)_
 
-- [Boostnote](https://boostnote.io/) - The note-taking app for programmers that focuses on markdown, snippets, and customizability. ([Source Code](https://github.com/BoostIO/Boostnote)) `GPL-3.0` `Javascript`
 - [BulletNotes](https://bulletnotes.io/) - Workflowy / Dynalist clone with Kanban (Trello) and Calendar functionality. Organize everything. ([Source Code](https://gitlab.com/NickBusey/BulletNotes)) `MIT` `Nodejs`
 - [DailyNotes](https://github.com/m0ngr31/DailyNotes/) - App for taking notes and tracking tasks on a daily basis in Markdown. `MIT` `Python`
 - [dillinger](https://dillinger.io/) - The last Markdown editor, ever. ([Source Code](https://github.com/joemccann/dillinger)) `MIT` `Nodejs`