Update docs for Artemis v0.16.0

docs/getstarted/fleet/index.mdx

@@ -42,6 +42,12 @@ file.
 
 The Artemis command line tool is a standalone executable written in Toit. Use `artemis help` for usage help.
 
+## Git
+
+Artemis needs `git` to be installed on your system. On most macOS and Linux systems,
+`git` is already installed. On Windows, you can download and install `git` from
+[git-scm.com](https://git-scm.com/download/win).
+
 ## Signing up and logging in
 
 All users must be authenticated. For OAuth-based authentication you can just
@@ -130,8 +136,8 @@ possible specification by putting the following content into the `my-pod.yaml` f
 
 $schema: https://toit.io/schemas/artemis/pod-specification/v1.json
 name: my-pod
-sdk-version: v2.0.0-alpha.134
-artemis-version: v0.15.4
+sdk-version: v2.0.0-alpha.139
+artemis-version: v0.16.0
 max-offline: 0s
 connections:
   - type: wifi

docs/getstarted/fleet/pods.mdx

@@ -103,8 +103,8 @@ It is in YAML format and looks similar to this:
 
 $schema: https://toit.io/schemas/artemis/pod-specification/v1.json
 name: example
-sdk-version: v2.0.0-alpha.134
-artemis-version: v0.15.4
+sdk-version: v2.0.0-alpha.139
+artemis-version: v0.16.0
 max-offline: 0s
 connections:
   - type: wifi