Not in the application - the pages are available to the users for good reasons, and downgrading your installation by blocking them really isn't advisable. You will get people saying "Atlassian docs say this and I want to see it, but your Jira is broken and takes me to this page that I don't want"
If you insist on hacking this damage in, the best way is probably to catch the user in Apache and redirect them. That avoids having to do nasty code changes in Jira, but you'll have to think about how you identify the admins.
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