Update blog post and documentation

Author: jpraynaud

docs/blog/2022-09-07-genesis-certificate-feature.md

@@ -4,6 +4,9 @@ authors:
 - name: Mithril Team
 tags: [genesis, breaking-change]
 ---
+
+**Update**: The PR has been merged and the feature is being deployed on the GCP Mithril Aggregator.
+
 ### This afternoon, we plan to merge the PR that activates the Genesis Certificate feature on the GCP Mithril Aggregator
 
 **PR**: `Implement Real Genesis Certificate` [#438](https://github.com/input-output-hk/mithril/pull/438)

docs/root/manual/developer-docs/nodes/mithril-aggregator.md

@@ -266,6 +266,18 @@ Run a local Docker container
 make docker-run
 ```
 
+## Subcommands
+
+Here are the subcommands available:
+
+| Subcommand | Performed action |
+|------------|------------------|
+| **serve** | Aggregator runs its HTTP server in nominal mode and orchestrates multi signatures production |
+| **help** | Print this message or the help of the given subcommand(s) |
+| **genesis export** | Export genesis payload to sign with genesis secret key |
+| **genesis import** | Import genesis signature (paylod signed with genesis secret key) and create & import a genesis certificate in the store |
+| **genesis bootstrap** | Bootstrap a genesis certificate (test only usage) |
+
 ## Configuration parameters
 
 The configuration parameters are set either: