first commit

web/templates/pages/error.html

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+{{template "base" .}}
+
+{{define "content"}}
+<div class="text-center py-5">
+    <i class="bi bi-exclamation-triangle display-1 text-danger"></i>
+    <h1 class="mt-4">{{.title}}</h1>
+    <p class="lead text-muted">{{.message}}</p>
+    <a href="/" class="btn btn-primary mt-3"><i class="bi bi-house-door me-1"></i>ダッシュボードに戻る</a>
+</div>
+{{end}}