docs: add Markdown report pages for Cloud and CE (#320)

## 📝 Description
Document how to use Markdown Reports in Cloud and CE

See #297

## ✅ Checklist
- [X] I have tested this change
- [ ] This change requires documentation update

Author: TomFern

docs/docs/reference/toolbox.md

@@ -514,6 +514,8 @@ The available commands are:
 - `compile`: parses JUnit XML files to a well-defined JSON report file
 - `gen-pipeline-report`: fetches and combines workflow-level JUnit report and combines them
 - `publish`: parses XML JUnit file to a well-defined JSON schema and publishes results to artifacts storage
+- `command-metrics`: generates a Markdown-compatible Mermaid.js Gantt diagram showing the job commands timeline. Used to produce [Markdown Reports](../using-semaphore/tests/markdown-reports)
+- `resource-metrics`: generates a Markdown-compatible computer resource report for the job. Used to produce [Markdown Reports](../using-semaphore/tests/markdown-reports)
 
 The available flags are:
 

docs/docs/using-semaphore/tests/flaky-tests.md

@@ -1,6 +1,6 @@
 ---
 description: Find unreliable tests
-sidebar_position: 2
+sidebar_position: 3
 ---
 
 # Flaky Tests
@@ -334,4 +334,4 @@ required:
 ## See also
 
 - [How to configure test reports](./test-reports)
-- [How to set up Slack notifications](../organizations#slack-notifications)
+- [How to set up Slack notifications](../organizations#slack-notifications)