docs updates

- added part for fixed navbar/footer incl. the responsive classes
- added anchor info for fixed navbar
- added .dropdown-menu-lg/-xl info in main-header docs
- added custom plugin colors in layout colors part
  - custom-range
  - custom-switch
  - bootstrap slider
  - icheck-bootstrap

docs/layout.md

@@ -24,12 +24,27 @@ AdminLTE 3.0 provides a set of options to apply to your main layout. Each one of
 
 
 - Fixed Sidebar: use the class `.layout-fixed` to get a fixed sidebar.
-- Fixed Navbar: use the class `.layout-navbar-fixed` to get a navbar navbar.
-- Fixed Footer: use the class `.layout-footer-fixed` to get a navbar footer.
+- Fixed Navbar: use the class `.layout-navbar-fixed` to get a fixed navbar.
+- Fixed Footer: use the class `.layout-footer-fixed` to get a fixed footer.
 - Collapsed Sidebar: use the class `.sidebar-collapse` to have a collapsed sidebar upon loading.
 - Boxed Layout: use the class `.layout-boxed` to get a boxed layout that stretches only to 1250px.
 - Top Navigation: use the class `.layout-top-nav` to remove the sidebar and have your links at the top navbar.
 
+
+##### Responsive Variations
+You can also use the following classes for responsive changes with placing 
+- Fixed Navbar: 
+  - use the class `.layout-*-navbar-fixed` to get a fixed navbar.
+  - use the class `.layout-*-navbar-not-fixed` to get a not fixed navbar.
+- Fixed Footer: 
+  - use the class `.layout-*-footer-fixed` to get a fixed footer.
+  - use the class `.layout-*-footer-not-fixed` to get a not fixed footer.
+
+> ##### Tip!
+> If you want to use anchors with a fixed navbar, you need to add `.anchor` to you hidden anchor, e.g. `<a id="testAnchor" class="anchor"></a>`.
+{: .quote-info}
+
+
 #### Color Variations
 
 AdminLTE 3.0 provides a set of color variations to apply to your sidebar (light & dark) & navbar. You can combine any available color with these class prefixes:
@@ -81,3 +96,18 @@ The following colors are available:
 > You can use these color variations even with `.text-*`, `.bg-*` & much more.
 {: .quote-info}
 
+
+##### Custom Range / Switch
+For custom colored custom-range you can add this classes:
+- `.custom-range-*`
+
+For custom colored custom-switch you can add this classes:
+- `.custom-switch-off-*` (for custom switch off)
+- `.custom-switch-on-*` (for custom switch on)
+
+##### Plugin Support
+You can use the all the colors above with these plugins:
+- Bootstrap Slider
+  - `.slider-*` (wrapped around the slider)
+- iCheck-Bootstrap
+  - `.icheck-*`