Fix SecureDrop link on Contact page.
Fix SecureDrop link on Contact page.

The SecureDrop link reference was capitalized, but the link is really securedrop, thus we had a 404 on that method of document leak. Sigh.
lucyparsons/lucyparsonslabs.com,lucyparsons/lucyparsons.github.io,lucyparsons/lucyparsonslabs.com,lucyparsons/lucyparsons.github.io,lucyparsons/lucyparsonslabs.com,lucyparsons/lucyparsonslabs.com,lucyparsons/lucyparsons.github.io,lucyparsons/lucyparsons.github.io