Chore: remove no longer used logic for user insight pages in tools URL

[nickytonline]

We no longer need to handle cases like this, pages/${username}/${pageId}/${tool.name.toLowerCase() when building the pageNavLink in https://github.com/open-sauced/app/blob/beta/components/organisms/ToolList/nav.tsx

More context:

Nick: @brandonroberts tagging you as I see you were in this file recently. This fixes the issue by adding /explore/topic/, but this link variable is doing way too much. What is the scenario this is used for when it's pages/${username}/${pageId}/${tool.name.toLowerCase()?

I'll probably need to add a check to only add /explore/topic/ if there is no username.

Brandon: pages/${username}/${pageId}/${tool.name.toLowerCase() was for the old insight page URLs that we don't need anymore as everything is workspaces except for the explore page

For example - pages/brandonroberts/324/dashboard

The tool setup does need a rework though. We broke up those pages for workspaces, but need to go back and do the same for the explore pages.

Originally posted by @brandonroberts in #3028 (comment)

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