Remove Koding from IDE/Tools

Koding as not been updated since February 2019 and the repo has been archived.
See https://github.com/koding/koding

README.md

@@ -1408,7 +1408,6 @@ _See [Ticketing](#ticketing)_
 - [JS Bin](http://jsbin.com/) - Open source collaborative web development debugging tool. ([Source Code](https://github.com/jsbin/jsbin)) `MIT` `Nodejs`
 - [Judge0 API](https://api.judge0.com) - Open source API to compile and run source code. ([Source Code](https://github.com/judge0/api)) `GPL-3.0` `Ruby`
 - [JupyterLab](http://jupyterlab.github.io/jupyterlab/) - Web-based environment for interactive and reproducible computing. ([Demo](https://mybinder.org/v2/gh/jupyterlab/jupyterlab-demo/try.jupyter.org?urlpath=lab), [Source Code](https://github.com/jupyterlab/jupyterlab/)) `BSD-3-Clause` `Python/Docker`
-- [Koding](http://www.koding.com/) - The simplest way to manage your entire Dev Infrastructure. ([Source Code](https://github.com/koding/koding)) `Apache-2.0` `Nodejs`
 - [ML Workspace](https://github.com/ml-tooling/ml-workspace) - All-in-one web-based IDE for machine learning and data science. `Apache-2.0` `Docker`
 - [Regexr](http://regexr.com/) - RegExr is a HTML/JS based tool for creating, testing, and learning about Regular Expressions. ([Source Code](https://github.com/gskinner/regexr)) `MIT` `Nodejs`
 - [RequestBin](https://github.com/Runscope/requestbin) - Inspect HTTP requests. Debug webhooks. `MIT` `python`