docs: remove pipeline status

[ci skip]

Author: brynblack

README.md

@@ -1,8 +1,5 @@
 # js-quic
 
-staging: [![pipeline status](https://gitlab.com/MatrixAI/open-source/js-quic/badges/staging/pipeline.svg)](https://gitlab.com/MatrixAI/open-source/js-quic/commits/staging)
-master: [![pipeline status](https://gitlab.com/MatrixAI/open-source/js-quic/badges/master/pipeline.svg)](https://gitlab.com/MatrixAI/open-source/js-quic/commits/master)
-
 QUIC library for TypeScript/JavaScript applications.
 
 This is built on top of Cloudflare's [quiche](https://github.com/cloudflare/quiche) library. It is intended to support Linux, Windows MacOS, Android and iOS. Mobile support is still pending.
@@ -23,7 +20,7 @@ See the example executables in `/src/bin`.
 
 ## Development
 
-Run `nix-shell`, and once you're inside, you can use:
+Run `nix develop`, and once you're inside, you can use:
 
 ```sh
 # install (or reinstall packages from package.json)