Removing MonstaFTP

No longer free software, from the repo:

```
THIS VERSION IS NO LONGER SUPPORTED AS VERSION 2 IS NOW THE STABLE RELEASE

Please visit www.monstaftp.com to download the latest version of Monsta FTP,
which is now proprietary software (i.e. it is no longer open source.)
```

README.md

@@ -722,7 +722,6 @@ _Command-line file upload_
 - [goBrowser](https://github.com/xataz/gobrowser) - Simple http file browser. ([Source Code](https://github.com/xataz/gobrowser)) `GPL-3.0` `Go`
 - [h5ai](https://larsjung.de/h5ai/) - Modern file indexer for HTTP web servers with focus on your files. Directories are displayed in a appealing way and browsing them is enhanced by different views, a breadcrumb and a tree overview. ([Demo](https://larsjung.de/h5ai/demo/), [Source Code](https://github.com/lrsjng/h5ai)) `MIT` `PHP`
 - [IFM](https://github.com/misterunknown/ifm/) - Single script file manager. `MIT` `PHP`
-- [Monsta FTP](http://www.monstaftp.com/) - Open source PHP/Ajax cloudware that puts FTP file management right in your browser, anywhere, any time. ([Demo](http://mftp.live/), [Source Code](https://github.com/MonstaApps/Monsta-FTP)) `GPL-3.0` `PHP`
 - [ResourceSpace](https://www.resourcespace.com) - ResourceSpace open source digital asset management software is the simple, fast, and free way to organise your digital assets. ([Demo](https://www.resourcespace.com/trial), [Source Code](https://www.resourcespace.com/svn)) `Other` `PHP`
 - [Sprut.io](https://sprut.io) - 2 panel file manager with drag and drop features, code editor, text search, hotkeys. ([Demo](https://demo.sprut.io:9443), [Source Code](https://github.com/LTD-Beget/sprutio)) `GPL-3.0` `Python`
 - [Surfer](https://github.com/nebulade/surfer) - Simple static file server with webui to manage files. `MIT` `Nodejs`