message: Update README.md
  Update quickstart with Docker command to use the GitHub registry, which is now the default.
diff: @@ -40,12 +40,11 @@ turning on file auto-save by clicking ``File > Auto Save ``.
  Note the Gitpod free account provides 100 hours of use for the month, so if
  you foresee needing more time, we recommend our nightly docker images.
  -The XACC nightly docker images also serve an Eclipse Theia IDE (the same IDE Gitpod uses) on port 3000. To get started, run
  +The XACC nightly docker images also serve an [Eclipse Theia IDE](https://theia-ide.org/) on port 3000. To get started, run
  ```bash
  -$ docker run --security-opt seccomp=unconfined --init -it -p 3000:3000 xacc/xacc
  +$ docker run --security-opt seccomp=unconfined --init -it -p 3000:3000 ghcr.io/eclipse/xacc/xacc:latest
  ```
  -Navigate to ``https://localhost:3000`` in your browser to open the IDE and get started with XACC. These are deployed
  -nightly, with ``xacc-tnqvm-exatn`` (tensor network simulator) and ``xacc-quac`` (pulse-level simulation) variants.
  +Navigate to ``https://localhost:3000`` in your browser to open the IDE and get started with XACC.
  Build from Source
  