docs: restructure content and enhance model descriptions

Restructured the content for better flow and clarity
Expanded the description of each pricing model
Added Pay per Event pricing model description
Formatted the content using Markdown syntax

Author: TC-MO

sources/platform/actors/publishing/monetize.mdx

@@ -9,6 +9,17 @@ sidebar_position: 2
 
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+Apify Store allows you to monetize your web scraping and automation projects by publishing them as Paid Actors. This guide explains the available pricing models and how to get started.
+
+## Pricing models
+
+Actors in the Apify Store can be published under one of the following pricing models:
+
+1. **Free**: Userc can run the Actor without any additional charges beyond the platform usage costs generated by the Actor
+2. **Rental**: Similar to the free model, users pay for the platform usage costs. However, after a trial period, they need to pay a flat monthly fee to the develop to continue using the Actor
+3. **Paid per Result**: Users don't pay for the platform usage costs. Instead, they pay the developer based on the number of results produced by the Actor.
+4. **Paid per Event**: Users don't pay for the platform usage cost the Actor generates. Instead, they pay based on specific events defined by the developer, such as generating a single result or initiating the Actor.
+
 When publishing your Actor on the Apify platform, you have the choice to make it a **Paid Actor** and get paid by the users benefiting from your tool.
 
 ## Pricing models