Add medical cannabis petition campaign

Add cover image, introduction, call-to-action, and thank-you pages
Add petition form styling and functionality
Include bilingual support for English and Norwegian
Implement signature confirmation flow
Add metadata for campaign configuration

content/underskriftskampanje/medisinsk-cannabis-pa-resept/takk/index.en.md

@@ -0,0 +1,17 @@
+# Thank you for signing!
+
+Your signature has been registered, but **must be confirmed** via email.
+
+<div class="warning-box" markdown="1">
+
+## Check your email
+
+We have sent you a confirmation email. **Click the link in the email** to confirm your signature.
+
+**Important:** Check your spam/junk folder if you don't find the email in your inbox within a few minutes.
+
+</div>
+
+Your signature will only be counted and displayed on the list after you have confirmed it.
+
+[Back to the petition](../)