Add Note for Komga Installation (Website)

[MickLesk]

Description

Reason: I tested the LXC earlier and wondered why I couldn't open the web UI.
It takes a moment to start. Sometimes up to 2 minutes.

Should only serve as information before bugs are created, e.g. if you call the URL / IP directly in the Proxmox shell.

Fixes # (issue)

Prerequisites

The following efforts must be made for the PR to be considered. Please check when completed:

• Self-review performed (I have reviewed my code, ensuring it follows established patterns and conventions)
• Testing performed (I have tested my changes, ensuring everything works as expected)
• Documentation updated (I have updated any relevant documentation)