feat: support hiding the main sidebar in desktop site (#778)

* feat: Remove the main sidebar entirely to free up more space for the main content of the page

* fix: ensure that the footer switches are still visible when the main sidebar has been disabled

* refactor: Repurpose Params.sidebar.hide to disable the main sidebar and disable the placeholder rather than adding a new front matter parameter

* fix: change wording from "disable" to "hide" in the documentation for hiding the sidebar

* fix: using incorrect hidden class in sidebar.html broke mobile navigation. Fixed this

---------

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

docs/content/docs/guide/configuration.md

@@ -164,6 +164,21 @@ menu:
       weight: 3
 ```
 
+### Hiding
+
+Hiding the sidebar can be done using front matter:
+
+```yaml {filename="content/docs/guide/configuration.md"}
+---
+title: Configuration
+sidebar:
+  hide: true
+---
+```
+
+This will hide the main sidebar from the page, freeing up space for the main content of the page.
+
+
 ## Right Sidebar
 
 ### Table of Contents