update holonix commands to get recommended version

src/pages/get-started/install-advanced.md

@@ -22,15 +22,22 @@ If you want to learn more about how this setup works and how to create it manual
 The flake-based one-liner to get you an ad-hoc Holonix shell looks like this:
 
 ```shell
-nix develop github:holochain/holonix
+nix develop github:holochain/holonix?ref=main-0.3
 ```
 
-The above one-liner will give you the latest version of Holochain from branch `main`. To get an ad-hoc shell with a specific version of Holochain, use the flag `--override-input versions <version_path>`.
+The above one-liner will give you the latest version of the **recommended** Holochain 0.3 release branch. To get an ad-hoc shell with a specific version of Holochain, change the `ref` parameter, for example:
 
 ```shell
-nix develop --override-input holochain "github:holochain/holochain?ref=main-0.4" github:holochain/holonix
+nix develop github:holochain/holonix?ref=main-0.4
 ```
 
+The options you should know about are:
+
+* `main` or no `ref` parameter: Bleeding-edge development version of Holochain (currently 0.5)
+* `main-0.4`: RC of Holochain 0.4 (be aware that many breaking changes are coming in the next RC)
+* `main-0.3`: The current recommended version of Holochain for everyday development
+* `main-0.2`: An older version of Holochain, no longer recommended
+
 ### A gotcha with Flakes and Git
 
 The behavior of `nix` commands that rely on a `flake.nix` as its input such as `nix develop` can be counterintuitive in a git repository.