docs: updated root menu items (#7061)

### Describe Your Changes

Please provide a brief description of the changes you made. Be as
specific as possible to help others understand the purpose and impact of
your modifications.

### Checklist

The following checks are **mandatory**:

- [ ] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).

---------

Signed-off-by: Artem Navoiev <tenmozes@gmail.com>
Co-authored-by: Artem Navoiev <tenmozes@gmail.com>

docs/VictoriaLogs/_index.md

@@ -1,6 +1,11 @@
 ---
 title: VictoriaLogs
 weight: 0
+menu:
+  docs:
+    weight: 15
+    identifier: victorialogs
+    pageRef: /victorialogs/
 aliases:
 - /VictoriaLogs/
 - /VictoriaLogs/index.html

docs/anomaly-detection/_index.md

@@ -1,6 +1,11 @@
 ---
 title: VictoriaMetrics Anomaly Detection
-weight: 0
+weight: 50
+menu:
+  docs:
+    weight: 50
+    identifier: anomaly-detection
+    pageRef: /anomaly-detection/
 aliases:
 - /anomaly-detection.html
 - /vmanomaly.html

docs/guides/_index.md

@@ -2,5 +2,11 @@
 weight: 0
 title: Guides
 disableToc: true
+
+menu:
+  docs:
+    weight: 20
+    identifier: guides
+    pageRef: /guides/
 ---
 {{% section %}}

docs/operator/_index.md

@@ -3,8 +3,9 @@ weight: 0
 title: Kubernetes Operator
 menu:
   docs:
-    weight: 30
+    weight: 35
     identifier: operator
+    pageRef: /operator/
 aliases:
   - /operator/
   - /operator/index.html

docs/victoriametrics-cloud/_index.md

@@ -1,7 +1,12 @@
 ---
 title: VictoriaMetrics Cloud
-weight: 01
+weight: 40
 disableToc: true
+menu:
+  docs:
+    weight: 40
+    identifier: cloud
+    pageRef: /victoriametrics-cloud/
 aliases:
   - /victoriametrics-cloud/index.html
   - /managed-victoriametrics/index.html