"On this page" right nav bar is wrongly indented

[smoya]

Describe the bug

The "ON THIS PAGE" right navigation bar in the spec documentation shows a wrong indentation. See the following screenshot, where schemas and bindings sections are wrongly indented.

Not sure if this is also affecting other pages than spec docs.

How to Reproduce

Go to https://www.asyncapi.com/docs/reference/specification/latest and look at the right navigation bar.

Expected behavior

To indent properly based on the HTML heading level.

cc @derberg @alequetzalli