docs: removed redundant 'VictoriaLogs' from title (#6715)

### Describe Your Changes

After breadcrumb was added to docs.victoriametrics.com there's no need
to specify parent page name in a title

<img width="1437" alt="Screenshot 2024-07-27 at 10 20 09"
src="https://github.com/user-attachments/assets/733f41f4-a727-4f52-a7c0-6019edf1b803">

Also added vmdocs to gitignore to avoid committing it

### Checklist

The following checks are **mandatory**:

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

.gitignore

@@ -7,6 +7,7 @@
 .vscode
 *.test
 *.swp
+/vmdocs
 /gocache-for-docker
 /victoria-logs-data
 /victoria-metrics-data