Sidebar navigation not highlighted when clicking section on explore page

[tim-hm]

issue

1. Activate explore page
2. Scroll down to a banner (ie "Featured Snaps" or "Must have snaps for developers")
3. Click "Discover more"
4. The correct page is activated but it has a back button and the left side navigation isn't selected.

expected behaviour

When activating a 'top level' section, I would expect the left nav bar to reflect the active page.

[d-loose]

That was a deliberate design choice. Do we need to rethink this? @anasereijo?

[anasereijo]

@d-loose as discussed on standup, if a category is selected from the Explore page, and it's also present on the side-nav, the side-nav item should become highlighted.