Add support for folder urls in the sidebar.

If present, clicking the folder goes to the URL itself. Toggling the folder requires
clicking the toggle arrow precisely. If URL is omitted, the whole folder title
works as a toggle.

_data/sidebars/merlin6_sidebar.yml

@@ -2,56 +2,42 @@
 # Follow the pattern here for the URLs -- no slash at the beginning, and include the .html. The link here is rendered exactly as is in the Markdown references.
 
 entries:
-- product: Merlin 6
-  levels: one
+- product: Merlin
+  version: 6
   folders:
   - title: Introduction
-    output: web
+    # URLs for top-level folders are optional. If omitted it is a bit easier to toggle the accordion.
+    #url: /merlin6/introduction.html
     folderitems:
     - title: Introduction
       url: /merlin6/introduction.html
-      output: web
     - title: Code Of Conduct
       url: /merlin6/code-of-conduct.html
-      output: web
     - title: Hardware And Software Description
       url: /merlin6/hardware-and-software.html
-      output: web
     - title: Migrating From Merlin5
       url: /merlin6/migrating.html
-      output: web
   - title: Accessing Merlin
     url: /merlin6/accessing-merlin6.html
-    output: web
     folderitems:
     - title: Requesting Merlin6 Accounts
       url: /merlin6/request-account.html
-      output: web
     - title: Accessing Interactive Nodes
       url: /merlin6/interactive.html
-      output: web
     - title: Merlin6 Data Directories
       url: /merlin6/data-directories.html
-      output: web
     - title: Accessing Slurm Cluster
       url: /merlin6/slurm-access.html
-      output: web
   - title: Merlin6 Slurm
     url: /merlin6/slurm.html
-    output: web
     folderitems:
     - title: Slurm Basic Commands
       url: /merlin6/slurm-basics.html
-      output: web
     - title: Slurm Configuration
       url: /merlin6/slurm-configuration.html
-      output: web
   - title: Support
-    output: web
     folderitems:
     - title: Contact
       url: /merlin6/contact.html
-      output: web
     - title: Known Problems and Troubleshooting
       url: /merlin6/troubleshooting.html
-      output: web