refactor: remove geerlingguy.docker dependency

Assume Docker and Docker Compose are already installed on the target
host. This decouples the role from a specific Docker installation
method; avoiding conflicts with existing setups.

README.md

@@ -12,13 +12,13 @@ This Ansible role automates the deployment of Gitea - a self-hosted Git service,
 
 ## Requirements
 
+- Docker and Docker Compose installed on the target host
 - jmespath Python library (install with: `pip install jmespath`)
 
 ## Sample Usage in a Playbook
 The following playbook was tested on the latest Debian 12, it should work on Ubuntu as well.
 
 ```yaml
-# Installs Docker and Compose if not available
 - name: Install Gitea using Docker Compose
   hosts: git.example.com
   become: yes