[Docs] - Creating a opinionated step-by-step guide for easier onboarding

### Why
Many users report a steep learning curve, especially when setting up rules, schedules, or advanced features like templates.
Documentation is insufficient for onboarding, leading to user frustration, particularly for new users.

### Background
One of the lessons from our user survey was that onboarding and user education need to be improved. Clearer tutorials would help new users get started with fewer frustrations, especially when navigating complex features like automation and syncing.

### Definition of Done / Delivery
Create a step-by-step **opinionated guide** (with a lot of screenshots) to extend the [Roadmap for new users](https://actualbudget.org/docs/getting-started/roadmap-for-new-users) and augment the [Starting Fresh](https://actualbudget.org/docs/getting-started/starting-fresh) guide as this guide give somewhat theoretical background on use of the program.

We'll keep the starting fresh _as-is_ - but point to the step-by-step guide and vice-versa.

It is essential that we have a lot of screenshots.

### Screenshots

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### Category

Overview