refactor(help): improve help extraction for scripts

- Standardize help section delimiters across scripts
- Update `show_help` functions to extract help text dynamically
- Enhance maintainability and readability of help-related code

bootstrap.sh

@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+#=== HELP START ===
 # run.sh – local wrapper for the “deb-changelog-action”
 #
 # Behaviour:
@@ -32,6 +33,7 @@
 #     (configs/cliff.debian.toml) is used.
 #   • PACKAGE_NAME, AUTHOR_NAME, AUTHOR_EMAIL are exported so the TOML template
 #     can reference them (e.g. {{ get_env(name="PACKAGE_NAME") }}).
+#=== HELP END ===
 set -euo pipefail
 
 REPO_URL="https://git.0xmax42.io/actions/deb-changelog-action"
@@ -46,7 +48,14 @@ OUTPUT_FILE="debian/changelog"
 CLIFF_CONFIG=""
 # ───────────────────────────────────────────────
 
-show_help() { sed -n '2,34p' "$0"; }
+show_help() {
+  sed -n '/^#=== HELP START ===/,/^#=== HELP END ===/ {
+    /^#=== HELP START ===/d
+    /^#=== HELP END ===/d
+    s/^#//
+    p
+  }' "$0"
+}
 
 # 1 ─ Parse CLI options ─────────────────────────
 while [[ $# -gt 0 ]]; do