DEV: Improve header dropdown toggle on mobile view #14
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Meta: https://meta.discourse.org/t/dropdown-header/226170/69?u=arkshine
On mobile view, the header dropdown toggle was never implemented, even before #11.
Also, since a header can have a link, both behaviors overlap.
To avoid introducing a behavior change, this PR does the following on mobile view:
This way, the user will not be misled into thinking that the header dropdown can be toggled when it's supposed to redirect to a URL.
Additionally, it would be beneficial to encourage admins not to define a URL for a header with a dropdown, as it's not immediately evident to the user that they can click on it.
Before:

After:
