fixing nav height and sub menu text overflow

Sanket Bhukan requested to merge sankt/purr-data:fix-Navbar into emscripten

fixed: #748

  1. added height to the nav menu (this removes main scrollbar at any screen-size unless the preferences menu is opened)
    • image
  2. nav sub menu text overflow
    • image
  3. indentation (menu.html)
  4. removed unwanted nav tag at line 2 (menu.html)

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