Add manual and download pages to website

website/src/download/index.njk

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+---
+layout: base.njk
+title: Download KST4Contest
+description: Download KST4Contest releases for Windows, Linux and macOS.
+---
+
+<section class="hero">
+  <h1>Download KST4Contest</h1>
+  <p>
+    Official builds are published through GitHub Releases for Windows, Linux
+    and macOS.
+  </p>
+
+  <div class="actions">
+    <a class="button" href="https://github.com/praktimarc/kst4contest/releases/latest">Latest Release</a>
+    <a class="button secondary" href="https://github.com/praktimarc/kst4contest/releases">All Releases</a>
+  </div>
+</section>

website/src/manual/en/index.njk

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+---
+layout: base.njk
+title: KST4Contest English Manual
+description: English user manual for KST4Contest.
+---
+
+<section class="section">
+  <h1>English Manual</h1>
+  <p>
+    The English manual is maintained centrally in GitHub and is also available
+    as PDF release artifact.
+  </p>
+
+  <p>
+    <a class="button" href="https://github.com/praktimarc/kst4contest/wiki">Open GitHub Wiki</a>
+  </p>
+</section>

website/src/manual/index.njk

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+---
+layout: base.njk
+title: KST4Contest Manual
+description: Online manual for KST4Contest, the contest-optimized ON4KST chat client.
+---
+
+<section class="hero">
+  <h1>KST4Contest Manual</h1>
+  <p>
+    User documentation for installation, configuration, features,
+    AirScout integration, log synchronization and contest workflow.
+  </p>
+
+  <div class="actions">
+    <a class="button" href="/manual/en/">English Manual</a>
+    <a class="button secondary" href="/manual/de/">Deutsches Handbuch</a>
+  </div>
+</section>