integration-docs: Update the Git integration doc.

Author: Niloth-p

zulip/integrations/git/doc.md

@@ -1,31 +1,54 @@
-Get Zulip notifications for your Git repositories!
+# Zulip Git integration
 
-1. {!create-an-incoming-webhook.md!}
+Get Zulip notifications for pushes to your Git repositories!
 
-1. {!download-python-bindings.md!}
+Note that Zulip also offers integrations for [GitHub](./github),
+[GitLab](./gitlab) and various other
+[version control hosting services][other-integrations].
 
-1. {!create-channel.md!}
+{start_tabs}
 
-1. {!change-zulip-config-file.md!}
+1.  {!create-an-incoming-webhook.md!}
 
-    You may also need to change the value of `STREAM_NAME`.
+1.  {!download-python-bindings.md!}
 
-    You can specify the branches that will be used for notifications by modifying
-    the `commit_notice_destination` function. By default,
-    pushes to the `main`, `master`, and `test-post-receive` branches will result in a
-    notification.
+1.  If your Git server and your Zulip server are on the same machine,
+    symlink the `post-receive` hook of your Git repository in your Git
+    server by running:
 
-1. Symlink `/usr/local/share/zulip/integrations/git/zulip_git_config.py`
-   to the `.git/hooks` directory of your Git repository.
+    `ln -s {{ integration_path }}/post-receive your-repo.git/hooks/post-receive`
 
-1. Symlink `/usr/local/share/zulip/integrations/git/post-receive`
-   to the `.git/hooks` directory of your Git repository.
+    Otherwise, copy the `post-receive` hook to your Git repository's
+    `/hooks` directory.
+
+    The `post-receive` hook is triggered on every push to the repository.
+
+1.  {!change-zulip-config-file.md!}
+
+1.  Copy the config file to the same directory as the `post-receive` hook.
+
+    `cp {{ config_file_path }} your-repo.git/hooks`
 
 !!! tip ""
 
-    You can test the plugin without changing your `main` branch by
-    pushing to the `test-post-receive` branch.
+    Use the `test-post-receive` branch to test the integration without
+    modifying your `main` branch.
+
+{end_tabs}
+
+### Configuration options
+
+In `{{ config_file_path }}`, you can set:
+
+- The channel where notifications are sent by updating the value of
+  `STREAM_NAME`. By default, notifications are sent to a channel named
+  "commits".
+
+- Which branches send notifications when pushed by updating the
+  `commit_notice_destination` function. By default, pushes to the `main`,
+  `master`, and `test-post-receive` branches will result in notifications.
 
-{!congrats.md!}
+- The message format used in your Zulip notifications by updating the
+  `format_commit_message` function.
 
-![Git bot message](/static/images/integrations/git/001.png)
+[other-integrations]: ../version-control