feat(ui): Add info about choosing a network subnet for DLE deployment (https://gitlab.com/postgres-ai/platform/-/issues/244)

Description

Under the snippet "Run ansible playbook to create server and install DLE SE" add information about choosing a network subnet for DLE deployment.

Add the additional texts for the following providers and Update ansible version

• AWS
• Hetzner
• DigitalOcean
• GCP

Related issue

https://gitlab.com/postgres-ai/platform/-/issues/244

Examples

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