[x] Disallow certain /content pages

[amberreeves]

Users are able to search for, find, and tweet/cite certain pages that Karie would like them to not have access to.

In the past, someone found and tweeted this url https://www.historyofvaccines.org/content/german-vaccination-law

when she would prefer that they had found this version of the content at this url https://www.historyofvaccines.org/timeline#EVT_77

We told her that we disallowed some /content urls and that after Google reindexed the site, they should no longer be discoverable by users.

Recently, the same thing happened. The Smithsonian included this url in an article https://www.historyofvaccines.org/content/asian-influenza-pandemic

when she would have preferred that they found this version of the content and used this url https://www.historyofvaccines.org/timeline#EVT_100808

[amberreeves]

i asked karie for a list of all pages she'd like us to disallow. waiting on response.