Add Astra child theme for Hop On Hop Off header & footer

- disables Astra header/footer via astra_header/astra_footer hooks and renders
  custom design markup (logo, nav dropdown, footer columns, socials, support)
- chrome.css scoped to .hoho (generated from the design source); chrome.js for
  burger/submenu/sticky/back-to-top; bundled icon sprite (reuses plugin's)
- parameterize scope-css.js scope via VC_SCOPE env

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J4hNL1PSHxXbu94SCenpKj

astra-child-hoponhopoff/style.css

@@ -0,0 +1,12 @@
+/*
+Theme Name: Hop On Hop Off (Astra Child)
+Theme URI: https://git.kaamyab.dev/vargha/TourWebsite
+Description: Astra child theme that replaces the Astra header and footer with the "Hop On Hop Off" design. Pairs with the Viator Collector plugin.
+Author: Amir Bagheri
+Template: astra
+Version: 1.0.0
+Text Domain: hoponhopoff
+*/
+
+/* Theme styles live in assets/chrome.css (scoped to .hoho). This file only
+   carries the child-theme header WordPress requires. */