Migrate dev:readme-preview to dev:readme in standalone script

mise.toml

@@ -25,7 +25,3 @@ run = 'hurl --test test/prod.hurl'
 [tasks.test]
 description = 'Run project tests'
 run = 'mix test'
-
-[tasks."dev:readme-preview"]
-description = 'Preview the README file via a GH flavoured markdown rendered'
-run = 'gh gfm-preview README.md'

scripts/dev/readme

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+#MISE description="Render README.md with GitHub Flavored Markdown preview"
+
+set -e
+
+source "$(dirname "$0")/../_helpers.sh"
+
+ensure_working_directory!
+
+gh gfm-preview README.md