refactor: streamline Ansible playbook and logrotate configurations

- Removed environment variable lookups for logrotate settings in logrotate configuration files, replacing them with hardcoded values.
- Updated the Ansible playbook to simplify project root, deploy user, and old server configurations by removing environment variable dependencies.
- Added tasks to copy Zsh configuration files from an old server to the new server, ensuring proper permissions and cleanup of temporary files.
- Enhanced logrotate configurations for bots and system logs to ensure consistent management of log files.

infra/logrotate/logrotate_system.conf.j2

@@ -5,9 +5,9 @@
 /var/log/nginx/*.log {
     daily
     missingok
-    rotate {{ lookup('env', 'LOGROTATE_RETENTION_DAYS') | default('30') }}
-    {% if lookup('env', 'LOGROTATE_COMPRESS') | default('true') | lower == 'true' %}compress{% endif %}
-    {% if lookup('env', 'LOGROTATE_DELAYCOMPRESS') | default('true') | lower == 'true' %}delaycompress{% endif %}
+    rotate 30
+    compress
+    delaycompress
     notifempty
     create 0644 www-data adm
     sharedscripts