Update Events (#10)

This update restructures the events page code and provides additional functionality.
- Overwrite old entries on re-submission of previously used emails
- Build data and stats caches on launch for use in submission checks and stats regeneration
- Update to form content
- Move stats function to separate utils file

Reviewed-on: ayo/website#10
Co-authored-by: Jimmy Vargo <james@ayo.tokyo>
Co-committed-by: Jimmy Vargo <james@ayo.tokyo>

events/templates/stats.html

@@ -13,7 +13,7 @@
 		<h1>AYO Events</h1>
 
 		<p>Thank you for your feedback submission!</p>
-		<p>アンケートのご協力いただき、ありがとうございました！</p>
+		<p>アンケートにご協力いただき、ありがとうございました！</p>
 
 		<br>
 		<p class="instructions">Here are some insights into what others have said.</p>
@@ -21,7 +21,7 @@
 		<br>
 
 		<div class="stats-table">
-			<span class="stats-header">Times ご都合の良いの時間</span>
+			<span class="stats-header">Times ご都合の良い時間</span>
 			{% for id, label in times.items() %}
 			<div class="stat-item">
 				<div class="stat-chart">
@@ -32,7 +32,7 @@
 			</div>
 			{% endfor %}
 			
-			<span class="stats-header">Topics of Interest 興味あるテーマ</span>
+			<span class="stats-header">Topics of Interest 興味のあるテーマ</span>
 			{% for id, label in topics.items() %}
 			<div class="stat-item">
 				<div class="stat-chart">
@@ -50,6 +50,17 @@
 				{% endfor %}
 			</div>
 
+			<span class="stats-header">Backgrounds 履歴・業種</span>
+			{% for id, label in background.items() %}
+			<div class="stat-item">
+				<div class="stat-chart">
+					<div class="pie-chart" style="background: conic-gradient(var(--color) 0%, var(--color) {{ data[id]['percent'] }}%, var(--bg) {{ data[id]['percent'] }}%, var(--bg) 100%);"></div>
+					<span class="stat-percent">{{ data[id]['percent'] }}%</span>
+				</div>
+				<div><p class="stat-label">{{ label }}</p></div>
+			</div>
+			{% endfor %}
+
 			<span class="stats-header">Languages 言語</span>
 			{% for id, label in languages.items() %}
 			<div class="stat-item">