Add Harvard's SecureDrop

[eloquence]

Onion address:
5kcyaqagvnrvyan7y5ntzreqsn2msowqlmtoo46qju2pctlbkzzztxqd.onion

Onion name:
harvard.securedrop.tor.onion

Directory entry:
https://securedrop.org/directory/institute-quantitative-social-science-harvard-university/

Landing page:
https://www.hmdc.harvard.edu/securedrop.html

[eloquence]

Upon discussion, they've requested iqss.harvard as the onion name. We're using a similar . format for disambiguation for ABC, so that seems reasonable to me.