Modularize bridge and improve control GUI

frigate_camera_control_bridge/templates/index.html

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+<!doctype html>
+<html lang="{lang}">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>{title}</title>
+<link rel="stylesheet" href="/static/app.css">
+</head>
+<body>
+<main class="shell">
+<div class="topbar">
+<div class="title-block">
+<h1>{title}</h1>
+<div class="summary"><strong>{action_count}</strong><span>{actions_label}</span></div>
+</div>
+<div class="toolbar">
+<form method="get" action="/" class="language-form">
+<label for="lang">{language_label}</label>
+{token_input}
+<select id="lang" name="lang" onchange="this.form.submit()">
+{language_options}
+</select>
+<noscript><button type="submit">OK</button></noscript>
+</form>
+</div>
+</div>
+<section class="control-grid">
+{cards}
+</section>
+</main>
+<script src="/static/app.js" defer></script>
+</body>
+</html>