Add legal, privacy, contact and roadmap pages

website/src/about/index.njk

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+---
+layout: base.njk
+title: About KST4Contest
+description: About KST4Contest and its contest-oriented ON4KST workflow.
+---
+
+<section class="hero">
+  <p class="badge">About</p>
+  <h1>Built for real contest operation.</h1>
+  <p class="lead">
+    KST4Contest was created to turn ON4KST chat activity into actionable contest workflow.
+  </p>
+</section>
+
+<section class="section narrow">
+  <article class="card content-card">
+    <h2>Why KST4Contest exists</h2>
+    <p>
+      Generic chat clients display messages. KST4Contest goes further:
+      it helps operators identify candidates, manage skeds, use AirScout timing,
+      synchronize with loggers and reduce workload during VHF/UHF/SHF contests.
+    </p>
+
+    <h2>Open source and practical</h2>
+    <p>
+      The project is open source and focused on practical contest station workflows.
+      Features are designed around real operating pressure, not theoretical UI concepts.
+    </p>
+  </article>
+</section>