[TASK] Rework the testing framework section in the docs (#1480)

Documentation/Index.rst

@@ -44,7 +44,7 @@ continuous integration.
 
    Introduction
    PHPVersionSupport
-   TestingFramework
+   ReleaseBranchingStrategy
    Environment
    DependencyManager
    Running

Documentation/ReleaseBranchingStrategy.rst

@@ -0,0 +1,65 @@
+.. include:: /Includes.rst.txt
+
+.. _release-branching-strategy:
+
+==============================
+Release and Branching Strategy
+==============================
+
+When maintaining TYPO3 extensions, developers often need to support multiple 
+TYPO3 Long-Term Support (LTS) versions simultaneously. This typically requires 
+a clear release and branching strategy to manage development and maintenance 
+across different TYPO3 versions.
+
+There are two common strategies for managing branches when supporting multiple 
+TYPO3 LTS versions.
+
+.. contents:: Table of Contents:
+   :backlinks: top
+   :class: compact-list
+   :depth: 2
+   :local:
+
+.. _release-branching-strategy-one-branch:
+
+Approach 1: One branch for multiple TYPO3 LTS versions
+======================================================
+
+In this approach, there is a single main branch that receives new features and 
+updates, while supporting multiple TYPO3 LTS versions at the same time.
+
+The downside of this approach is that it may require some version-dependent 
+code switches, which can increase complexity. However, the major advantage is 
+that there is only one branch to maintain, making it easier to implement new 
+features and code changes across all supported TYPO3 versions.
+
+This approach simplifies the maintenance of the extension and is preferred when 
+minimizing maintenance overhead is the primary concern.
+
+.. _release-branching-strategy-multiple-branches:
+
+Approach 2: Separate branch per TYPO3 LTS version
+=================================================
+
+In this approach, there is one main branch for each TYPO3 LTS version. This 
+means that each branch exclusively supports a single TYPO3 LTS version.
+
+The advantage here is that version-specific code can be used without requiring 
+version-dependent switches, reducing complexity in the codebase. However, this 
+approach increases the maintenance burden, as any new features or updates must 
+be applied to each branch individually.
+
+This approach may be necessary when there are significant differences between 
+TYPO3 LTS versions or when you want to avoid version-dependent code.
+
+.. _release-strategy-conclusion:
+
+Conclusion
+==========
+
+The appropriate release and branching strategy depends on the specific 
+requirements of the extension and the TYPO3 versions you are supporting. If 
+reducing maintenance complexity is a priority, using a single branch for 
+multiple versions is often the better choice. However, if you need to tailor 
+your extension for each version, a separate branch for each version may be more 
+suitable.