Remove now-non-functional RunKit references

Author: pimterry

README.md

@@ -1,4 +1,4 @@
-# Mockttp [![Build Status](https://github.com/httptoolkit/mockttp/workflows/CI/badge.svg)](https://github.com/httptoolkit/mockttp/actions) [![Available on NPM](https://img.shields.io/npm/v/mockttp.svg)](https://npmjs.com/package/mockttp)  [![Try Mockttp on RunKit](https://badge.runkitcdn.com/mockttp.svg)](https://npm.runkit.com/mockttp)
+# Mockttp [![Build Status](https://github.com/httptoolkit/mockttp/workflows/CI/badge.svg)](https://github.com/httptoolkit/mockttp/actions) [![Available on NPM](https://img.shields.io/npm/v/mockttp.svg)](https://npmjs.com/package/mockttp)
 
 > _Part of [HTTP Toolkit](https://httptoolkit.com): powerful tools for building, testing & debugging HTTP(S)_
 
@@ -66,8 +66,6 @@ describe("Mockttp", () => {
 });
 ```
 
-(Want to play with this yourself? Try running a standalone version live on RunKit: https://npm.runkit.com/mockttp)
-
 That is pretty easy, but we can make this simpler & more powerful. Let's take a look at some more fancy features:
 
 ```typescript

docs/api-docs-landing-page.md

@@ -1,4 +1,4 @@
-# Mockttp [![Build Status](https://github.com/httptoolkit/mockttp/workflows/CI/badge.svg)](https://github.com/httptoolkit/mockttp/actions) [![Available on NPM](https://img.shields.io/npm/v/mockttp.svg)](https://npmjs.com/package/mockttp)  [![Try Mockttp on RunKit](https://badge.runkitcdn.com/mockttp.svg)](https://npm.runkit.com/mockttp)
+# Mockttp [![Build Status](https://github.com/httptoolkit/mockttp/workflows/CI/badge.svg)](https://github.com/httptoolkit/mockttp/actions) [![Available on NPM](https://img.shields.io/npm/v/mockttp.svg)](https://npmjs.com/package/mockttp)
 
 > _Part of [HTTP Toolkit](https://httptoolkit.com): powerful tools for building, testing & debugging HTTP(S)_
 

docs/runkitExample.js

@@ -52,7 +52,6 @@
   "bin": {
     "mockttp": "dist/admin/admin-bin.js"
   },
-  "runkitExampleFilename": "./docs/runkitExample.js",
   "files": [
     "dist",
     "src",