docs(readme): fix contributors

Author: amyheather

README.md

@@ -1,7 +1,4 @@
 <div align="center">
-<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-4-orange.svg?style=flat-square)](#contributors-)
-<!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 # DES RAP Book: Reproducible Discrete-Event Simulation in Python and R
 
@@ -184,8 +181,6 @@ This project is supported by the Medical Research Council [grant number [MR/Z503
 
 ## Contributors
 
-Thanks goes to all of the following people ([emoji key](https://allcontributors.org/docs/en/emoji-key)).
-
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
 <!-- prettier-ignore-start -->
 <!-- markdownlint-disable -->
@@ -204,6 +199,3 @@ Thanks goes to all of the following people ([emoji key](https://allcontributors.
 <!-- prettier-ignore-end -->
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->
-
-This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
-