Update URL. (#67)

Use the release URL.
Note staging/release deployments.

Author: microbit-matt-hillsdon

README.md

@@ -14,13 +14,13 @@ as an iframe. The embedding API and URLs are not yet stable and are
 subject to change. If you are interested in embedding the simulator
 in your application please [get in touch](mailto:[email protected]).
 
-The URL to embed is https://python-simulator.usermbit.org/staging/simulator.html (subject to change, still under development).
+The URL to embed is https://python-simulator.usermbit.org/v/0.1.0/simulator.html (URL may change in future, for experimentation only).
 
 The iframe provides the micro:bit board user interface and some limited
 interactions. It does not provide a terminal for serial/the REPL or any UI to change the board sensor state.
 
 A value for a brand color can be passed to the simulator via a query
-string and is used to style the play button. E.g., https://python-simulator.usermbit.org/staging/simulator.html?color=blue
+string and is used to style the play button. E.g., https://python-simulator.usermbit.org/v/0.1.0/simulator.html?color=blue
 
 [demo.html](./src/demo.html) is an example of embedding the simulator.
 It connects the iframe to a terminal and provides a simple interface for
@@ -302,6 +302,10 @@ on PRs with deployment details.
 Branches in this repository are also deployed via CircleCI to https://review-python-simulator.usermbit.org/{branchName}/. This requires the user pushing code to have
 permissions for the relevant Micro:bit Educational Foundation infrastructure.
 
+Similarly, the main branch is deployed to https://python-simulator.usermbit.org/staging/.
+
+Tagged releases with a `v` prefix are deployed to https://python-simulator.usermbit.org/v/{number}/
+
 ### Upgrading micropython-microbit-v2
 
 1. Update the lib/micropython-microbit-v2 to the relevant hash. Make sure that its lib/micropython submodule is updated (see checkout instructions above).