make the canary lifetime 3 months

Signed-off-by: Ari Archer <ari@ari.lt>

page/canary/index.html

@@ -77,8 +77,9 @@
 
         <p>
             Note: This warrant canary carries legitimation only up until the
-            unpublication of the statement. As soon as the statement expires, it
-            will be removed. The statements made do not include any personal
+            unpublication of the statement or if it hasn't been updated in more
+            than <b>3 months</b>. A removal of this statement would be indicative of
+            instant expiry. The statements made do not include any personal
             qualities of predictability and do not carry any future
             implications.
         </p>

page/canary/index.html.asc

@@ -1,16 +1,16 @@
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+=+TZ+
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page/canary/sign.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env sh
+
+set -eu
+
+main() {
+    gpg --detach-sign --armor index.html
+    gpg --verify index.html.asc
+}
+
+main "$@"