fix(navbar): align mobile sidebar ordering and labels with menu.main (#883)

* fix(navbar): navbar on small screen now follow menu.main from hugo.yaml

* fix(navbar): align mobile sidebar with menu.main order and labels

* refactor(sidebar): simplify mobile menu item selection logic

* fix(sidebar): avoid empty nested containers in mobile nav tree

* fix(sidebar): align nested chevrons with top-level items

* chore(css): update compiled CSS

---------

Co-authored-by: Xin <5097752+imfing@users.noreply.github.com>
Co-authored-by: Xin <xin@imfing.com>

docs/hugo_stats.json

@@ -481,6 +481,7 @@
       "hx:ltr:pl-5",
       "hx:ltr:pl-6",
       "hx:ltr:pl-8",
+      "hx:ltr:pr-0",
       "hx:ltr:pr-1",
       "hx:ltr:pr-2",
       "hx:ltr:pr-4",
@@ -639,6 +640,7 @@
       "hx:rtl:mr-1",
       "hx:rtl:mr-3",
       "hx:rtl:mr-auto",
+      "hx:rtl:pl-0",
       "hx:rtl:pl-1",
       "hx:rtl:pl-2",
       "hx:rtl:pl-4",