Update documentation with indexing and references

Added the ':no-index:' directive to CLI, core, and exceptions API documentation to exclude them from indexing. Updated examples documentation to use Sphinx references for better navigation and added section anchors for improved structure.

docs/api/cli.md

@@ -7,6 +7,7 @@ The command-line interface module provides comprehensive functionality for the t
    :members:
    :undoc-members:
    :show-inheritance:
+   :no-index:
 ```
 
 ## Overview

docs/api/core.md

@@ -7,6 +7,7 @@ The core module provides the main functionality for working with tzst archives,
    :members:
    :undoc-members:
    :show-inheritance:
+   :no-index:
 ```
 
 ## TzstArchive Class

docs/api/exceptions.md

@@ -7,6 +7,7 @@ Custom exception classes used by tzst for comprehensive error handling and debug
    :members:
    :undoc-members:
    :show-inheritance:
+   :no-index:
 ```
 
 ## Overview