feat: modularize scripts and improve project architecture

- Added `lib/utils.sh` and `lib/logging.sh` for reusable utility and logging functions.
- Updated `run.sh` and `scripts/generate-changelog.sh` to use the new utility and logging functions (`validate_arg`, `log_info`, `log_error`).
- Add `config.env` for better clarity and updated all references in the project.
- Enhanced documentation in `README.md` to reflect the new configuration file and usage instructions.
- Improved error handling and logging consistency across scripts.

lib/utils.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# utils.sh - Utility functions for the project
+
+# Function to check if a required command is available
+need() {
+  command -v "$1" >/dev/null || { echo "❌ $1 is required but not installed"; exit 1; }
+}
+
+# Function to log messages with levels
+log() {
+  local level="$1"
+  local message="$2"
+  echo "[$level] $message"
+}
+
+# Function to validate input arguments
+validate_arg() {
+  local arg_name="$1"
+  local arg_value="$2"
+  if [[ -z "$arg_value" ]]; then
+    log "ERROR" "Missing required argument: $arg_name"
+    exit 1
+  fi
+}