Enhanced Changelog Entry Management

## What's New
In this release, we have transitioned from using pull requests (PRs) to a dedicated system for managing changelog entries. Users will now see updated references throughout the application, including a new method for tracking their monthly usage of changelog entries. This change helps clarify the functionality and aligns our terminology with current practices.

## Improvements
The billing interface has been enhanced to provide clearer insights into the number of changelog entries created each month. Users will now see a detailed breakdown on the billing page, allowing them to monitor their usage and ensure they stay within their plan limits. Additionally, some user interactions, such as team project updates, have been refined to improve overall responsiveness and accessibility.

## Breaking Changes
Please note that previous references to pull request summaries have been replaced with changelog entries. This means that users will need to adapt to the new terminology when navigating the application. The functionality remains similar, but the focus now shifts entirely to changelog management.