Fix broken links

We need to fix these broken links.

In https://community.torproject.org/relay/community-resources/tor-exit-guidelines, broken links:

• https://community.torproject.org/relay/community-resources/tor-exit-guidelines/good-bad-isps
• https://community.torproject.org/relay/community-resources/tor-exit-guidelines/tor-abuse-templates

In https://community.torproject.org/relay/community-resources/tor-abuse-templates, broken links:

• https://community.torproject.org/relay/community-resources/tor-abuse-templates/tor-exit-guidelines

In https://community.torproject.org/relay/community-resources/tor-relay-universities/, broken link:

• https://www.torproject.org/svn/trunk/doc/design-paper/tor-design.html

In https://community.torproject.org/relay/setup/guard/centosrhel/updates, broken link:

• https://doc.opensuse.org/documentation/leap/startup/html/book.opensuse.startup/cha.onlineupdate.you.html#sec.onlineupdate.you.automatically

In https://community.torproject.org/relay/community-resources/eff-tor-legal-faq/, broken link:

• https://community.torproject.org/relay/community-resources/eff-tor-legal/faq/tor-dmca-response

In https://community.torproject.org/relay/relays-requirements/, broken link:

• https://community.torproject.org/relay/relays-requirements/relay/setup/bridge

In https://community.torproject.org/user-research/guidelines/, broken link:

• https://limesurvey/ (ERRNO_ENOTFOUND)
• https://linkto/ (ERRNO_ENOTFOUND)