style(config): update the formatting

Signed-off-by: orhun <orhunparmaksiz@gmail.com>

gitolith.toml

@@ -2,6 +2,7 @@
 # changelog header
 header = """
 # Changelog
+
 All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
@@ -11,16 +12,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 # template for the changelog body
 # https://tera.netlify.app/docs/#introduction
 body = """
-## {% if version %}[{{ version }}] - {{ timestamp | date(format="%Y-%m-%d") }}{% else %}[unreleased]{% endif %}
+{% if version %}\
+## [{{ version | replace(from="v", to="") }}] - {{ timestamp | date(format="%Y-%m-%d") }}
+{% else %}
+## [unreleased]
+{% endif %}\
 {% for group, commits in commits | group_by(attribute="group") %}
 ### {{ group | capitalize}}
 {% for commit in commits %}
-- {{ commit.message }}{% endfor %}
+- {{ commit.message }}\
+{% endfor %}
 {% endfor %}
 """
 
 # changelog footer
-footer = ""
+footer = """
+<!-- generated by gitolith -->
+"""
 
 # regex patterns for grouping commits
 group_parsers = [