Remove repo count from the Explore page
Created by: dadlerj
Fixes https://github.com/sourcegraph/sourcegraph/issues/10461
Turns out we do usually show this, but there are a few issues:
1) currently, non-admins will never see it, due to an error
edit: this was intentional: see history at https://github.com/sourcegraph/sourcegraph/issues/1860!
- sometimes, the handler will return nil for various reasons
I fixed the former case, and in the latter case I added a fallback.
edit: I removed the total count from the explore page entirely and added a link that will always appear