save oauth user_id and link users and accounts

internal/site/templates/page_bodies/account-creation.html.tmpl

@@ -0,0 +1,16 @@
+{{- define "title" }} Inventory++ Create an Account {{ end }}
+
+{{- componentBody "nav_bar" "dot" . }}
+
+{{/* TODO: will need to verify the email address */}}
+
+<section style="margin-top: 2em;">
+	<form method="post" action="/accounts">
+		<label>
+			Email:
+			<input type="email" required name="email" />
+		</label>
+
+		<input type="submit" value="Create Account" />
+	</form>
+</section>