Close resolved issues

This commit summarizes all issues addressed in recent commits:

Fixes #327 - Undefined method 'as' error (fixed in separate branch)
Fixes #311 - Systemd lingering configuration issues
Fixes #314 - Sidekiq logging configuration
Fixes #307 - sidekiq:uninstall without sudo for user services
Fixes #312 - Added comprehensive per-server configuration docs
Fixes #240 - Created detailed systemd integration documentation

Already resolved in codebase:
Fixes #234 - Removed deprecated --index argument
Fixes #292 - Systemd escape issue (not present in current implementation)
Fixes #238 - Hook for sidekiq:stop after deploy:reverted already exists

Author: seuros