feat(site): add seek button api reference

closes #531

site/src/components/docs/demos/seek-button/html/css/BasicUsage.astro

@@ -0,0 +1,10 @@
+---
+import HtmlDemo from '@/components/docs/demos/HtmlDemo.astro';
+import html from './BasicUsage.html?raw';
+import './BasicUsage.css';
+---
+
+<HtmlDemo html={html} />
+<script>
+  import './BasicUsage.ts';
+</script>

site/src/components/docs/demos/seek-button/html/css/BasicUsage.css

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+.seek-button-basic {
+  position: relative;
+}
+
+.seek-button-basic video {
+  width: 100%;
+}
+
+.seek-button-basic__buttons {
+  display: flex;
+  gap: 8px;
+  position: absolute;
+  bottom: 10px;
+  left: 10px;
+}
+
+.seek-button-basic__button {
+  padding-block: 8px;
+  background: rgba(255, 255, 255, 0.7);
+  backdrop-filter: blur(10px);
+  color: black;
+  border: 1px solid rgba(255, 255, 255, 0.3);
+  border-radius: 9999px;
+  padding-inline: 20px;
+  white-space: nowrap;
+  cursor: pointer;
+}
+
+.seek-button-basic__button .show-when-backward {
+  display: none;
+}
+.seek-button-basic__button .show-when-forward {
+  display: none;
+}
+.seek-button-basic__button[data-direction="backward"] .show-when-backward {
+  display: inline;
+}
+.seek-button-basic__button[data-direction="forward"] .show-when-forward {
+  display: inline;
+}

site/src/components/docs/demos/seek-button/html/css/BasicUsage.html

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+<video-player class="seek-button-basic">
+    <video
+        src="https://stream.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/highest.mp4"
+        autoplay
+        muted
+        playsinline
+        loop
+    ></video>
+    <div class="seek-button-basic__buttons">
+        <media-seek-button seconds="-5" class="seek-button-basic__button">
+            <span class="show-when-backward">&#9194; 5s</span>
+        </media-seek-button>
+        <media-seek-button seconds="10" class="seek-button-basic__button">
+            <span class="show-when-forward">10s &#9193;</span>
+        </media-seek-button>
+    </div>
+</video-player>

site/src/components/docs/demos/seek-button/html/css/BasicUsage.ts

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+import '@videojs/html/video/player';
+import '@videojs/html/ui/seek-button';

site/src/components/docs/demos/seek-button/react/css/BasicUsage.css

@@ -0,0 +1,27 @@
+.seek-button-basic {
+  position: relative;
+}
+
+.seek-button-basic video {
+  width: 100%;
+}
+
+.seek-button-basic__buttons {
+  display: flex;
+  gap: 8px;
+  position: absolute;
+  bottom: 10px;
+  left: 10px;
+}
+
+.seek-button-basic__button {
+  padding-block: 8px;
+  background: rgba(255, 255, 255, 0.7);
+  backdrop-filter: blur(10px);
+  color: black;
+  border: 1px solid rgba(255, 255, 255, 0.3);
+  border-radius: 9999px;
+  padding-inline: 20px;
+  white-space: nowrap;
+  cursor: pointer;
+}

site/src/components/docs/demos/seek-button/react/css/BasicUsage.tsx

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+import { createPlayer, features, SeekButton, Video } from '@videojs/react';
+
+import './BasicUsage.css';
+
+const Player = createPlayer({ features: [...features.video] });
+
+export default function BasicUsage() {
+  return (
+    <Player.Provider>
+      <Player.Container className="seek-button-basic">
+        <Video
+          src="https://stream.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/highest.mp4"
+          autoPlay
+          muted
+          playsInline
+          loop
+        />
+        <div className="seek-button-basic__buttons">
+          <SeekButton
+            seconds={-5}
+            className="seek-button-basic__button"
+            render={(props, state) => (
+              <button {...props}>
+                {state.direction === 'backward' ? '\u23EA' : '\u23E9'} {5}s
+              </button>
+            )}
+          />
+          <SeekButton
+            seconds={10}
+            className="seek-button-basic__button"
+            render={(props, state) => (
+              <button {...props}>
+                {10}s {state.direction === 'forward' ? '\u23E9' : '\u23EA'}
+              </button>
+            )}
+          />
+        </div>
+      </Player.Container>
+    </Player.Provider>
+  );
+}