Improve transition from basic 2-line setup to advanced customization

## Problem
Users find the transition from the simple 2-line setup to more customized logging confusing, as mentioned in feedback.

## Files to Update
- docs/v2/quickstart.mdx
- docs/v2/introduction.mdx

## Changes Needed
- Add progressive complexity examples showing levels of customization
- Create clear pathways from basic to advanced usage
- Improve organization of customization options
- Add 'next steps' guidance after basic setup

## Context
The 2-line setup is great for getting started, but users struggle to understand how to add more sophisticated logging and customization.

## Assignee
Please assign to Dwij when creating