add documentation in the development manual

docs/source/development_manual/customization.rst

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+Customization Guide
+=================
+
+This guide explains how to customize the Kompass application using configuration files and templates.
+
+Configuration Files
+-----------------
+
+The application uses two main configuration files:
+
+* ``settings.toml``: Contains core application settings
+* ``text.toml``: Contains customizable text content
+
+settings.toml
+~~~~~~~~~~~~
+
+The ``settings.toml`` file contains all core configuration settings organized in sections:
+
+.. code-block:: toml
+
+    [section]
+    name = "Your Section Name"
+    street = "Street Address"
+    town = "12345 Town"
+    # ... other section details
+
+    [LJP]
+    contribution_per_day = 25
+    tax = 0.1
+
+    [finance]
+    allowance_per_day = 22
+    max_night_cost = 11
+
+Key sections include:
+
+* ``[section]``: Organization details
+* ``[LJP]``: Youth leadership program settings
+* ``[finance]``: Financial configurations
+* ``[misc]``: Miscellaneous application settings
+* ``[mail]``: Email configuration
+* ``[database]``: Database connection details
+
+Customizing Model Fields
+~~~~~~~~~~~~~~~~~~~~~~~
+
+The ``[custom_model_fields]`` section in ``settings.toml`` allows you to customize which fields are visible in the admin interface:
+
+.. code-block:: toml
+
+    [custom_model_fields]
+    # Format: applabel_modelname.fields = ['field1', 'field2']
+    #         applabel_modelname.exclude = ['field3', 'field4']
+
+    # Example: Show only specific fields
+    members_emergencycontact.fields = ['prename', 'lastname', 'phone_number']
+
+    # Example: Exclude specific fields
+    members_member.exclude = ['ticket_no', 'dav_badge_no']
+
+There are two ways to customize fields:
+
+1. Using ``fields``: Explicitly specify which fields should be shown
+   - Only listed fields will be visible
+   - Overrides any existing field configuration
+   - Order of fields is preserved as specified
+
+2. Using ``exclude``: Specify which fields should be hidden
+   - All fields except the listed ones will be visible
+   - Adds to any existing exclusions
+   - Original field order is maintained
+
+Field customization applies to:
+   - Django admin views
+   - Admin forms
+   - Model admin fieldsets
+
+.. note::
+    Custom forms must be modified manually as they are not affected by this configuration.
+
+Text Content
+-----------
+
+The ``text.toml`` file allows customization of application text content:
+
+.. code-block:: toml
+
+    [emails]
+    welcome_subject = "Welcome to {section_name}"
+    welcome_body = """
+    Dear {name},
+    Welcome to our organization...
+    """
+
+    [messages]
+    success_registration = "Registration successful!"
+
+Templates
+---------
+
+Template Customization
+~~~~~~~~~~~~~~~~~~~~
+
+You can override any template by placing a custom version in your project's templates directory:
+
+1. Create a directory structure matching the original template path
+2. Place your custom template file with the same name
+3. Django will use your custom template instead of the default
+
+Example directory structure::
+
+    templates/
+    └── members/
+        └── registration_form.tex
+    └── startpage/
+        └── contact.html
+        └── impressum_content.html
+
+