Add tor onion link

Signed-off-by: Shield of Self-Defense (ocf.tw) <ssd@ocf.tw>

overrides/main.html

@@ -1,6 +1,10 @@
 {% extends "base.html" %} {% block site_meta %}
 <meta charset="utf-8" />
 <meta name="viewport" content="width=device-width,initial-scale=1" />
+<meta
+  http-equiv="onion-location"
+  content="http://ssdocftwvq6csls7gnjubyrmar7no7ww3gmgodhznxgsoor6ot42lrad.onion/{{page.url}}"
+/>
 
 <!-- Page description -->
 {% if page.meta and page.meta.description %}

overrides/partials/copyright.html

@@ -9,6 +9,12 @@
     （<a href="/support/copyright.html">如何引用？</a>） |
     <a href="https://ocf.tw/">{{ config.site_author }}</a>
   </div>
+  <div>
+    教材網址 (Tor)：<a
+      href="http://ssdocftwvq6csls7gnjubyrmar7no7ww3gmgodhznxgsoor6ot42lrad.onion/{{page.url}}"
+      >http://ssdocftwvq6csls7gnjubyrmar7no7ww3gmgodhznxgsoor6ot42lrad.onion/{{page.url}}</a
+    >
+  </div>
   {% endif %} {% if not config.extra.generator == false %} Made with
   <a
     href="https://squidfunk.github.io/mkdocs-material/"