Add basic Uckermark campaign page

Author: stefanw

_includes/uckermark/intro.html

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+<div id="intro" class="col-12">
+
+    <h1>Briefwahl zur Landratswahl im Landkreis Uckermark</h1>
+    <div class="subtitle">
+
+    </div>
+</div>

_includes/uckermark/outro.html

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+<h1>{% t left.share %}</h1>
+<p class="mb-4">{% t left.description %}</p>
+
+<a class="copy" data-clipboard-text="{% t right.sharing.copy %}" href="#"
+    data-bs-placement="top" data-bs-toggle="tooltip" title="{% t right.message.sharecopy %}"><i
+        class="far fa-copy"></i></a>
+<a
+    href="mailto:?subject={% t right.sharing.email.subject %}&amp;body={% t right.sharing.email.body %}"><i
+        class="fas fa-envelope"></i></a>
+<a href="https://facebook.com/sharer/sharer.php?u={{ page.share_url }}" target="_blank"
+    rel="noreferrer nopener"><i class="fa-brands fa-facebook"></i></a>
+<a href="https://bsky.app/intent/compose?text={% t right.sharing.bluesky %}" target="_blank"
+    rel="noreferrer nopener"><i class="fa-brands fa-bluesky"></i></a>
+<a href="https://www.linkedin.com/sharing/share-offsite/?url={{ page.share_url }}"
+    target="_blank" rel="noreferrer nopener"><i class="fa-brands fa-linkedin-in"></i></a>
+<a href="https://t.me/share/url?text={% t right.sharing.telegram %}&amp;url={{ page.share_url }}"
+    target="_blank" rel="noreferrer nopener"><i class="fa-solid fa-paper-plane"></i></a>
+<a href="https://wa.me/?text={% t right.sharing.whatsapp %}" target="_blank"
+    rel="noreferrer nopener"><i class="fa-brands fa-whatsapp"></i></a>
+
+<h3 class="mt-5 mb-3">{% t left.donateTitle %}</h3>
+<a class="donate" href="{{ site.donate_url }}">{% t left.donateButton %}</a>

assets/images/partners/campact.svg

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+---
+layout: app
+app_intro: uckermark/intro.html
+app_outro: uckermark/outro.html
+partner_logo: /assets/images/partners/campact.svg
+partner_name: Campact
+partner_url: https://www.campact.de/
+disable_translations: true
+share_url: https://wahlbrief.de/uckermark/?pk_campaign=socialmediashare
+data:
+  limitArs:
+    - "120730008008"
+    - "120730069069"
+    - "120735303085"
+    - "120735304189"
+    - "120735305201"
+    - "120735306225"
+    - "120730384384"
+    - "120730429429"
+    - "120730452452"
+    - "120735051532"
+    - "120730572572"
+    - "120730579579"
+    - "120735051440"
+  election:
+    state: "BB"
+    stateName: "Brandenburg"
+    date: "2026-04-19"
+    name: "Landratswahl Uckermark"
+
+---