fix(engine): add hint about Postgres logs (#473)

Description

Add hint about Postgres logs

Related issue

#473 (closed)

Examples

2023/01/19 16:00:28 tools.go:424: [INFO]   Postgres logs are not present here; to troubleshoot,
check the mounted logs directory (/home/artyom/.dblab/engine/logs) on the DLE machine to find 
and inspect Postgres logs.

Checklist

• MR description has been reviewed
• MR changes are functionally tested
• MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed & DOCS ARE ADJUSTED (reference doc, etc)
• MR does NOT have UI changes OR there are UI changes and they have been reviewed & UX IS REVIEWED

Closes #473 (closed)