Change menu’s and profile icon

Eventually, we will allow people to upload their own profile images,
but until then we’ll use a “generic” profile icon instead of the closed
icon, that means nothing to users.

We wanted to have the same icon for that menu than for the Account item,
but the one we used until now did not look inside the round button for
the menu, thus we changed the two.

Related to #55.

web/template/app.gohtml

@@ -14,12 +14,12 @@
 			<h1><img src="/static/numerus.svg" alt="Numerus" width="261" height="33"></h1>
 			<details id="profile-menu" class="menu">
 				<summary>
-					<i class="ri-eye-close-line ri-3x"></i>
+					<i class="ri-user-6-line ri-3x"></i>
 				</summary>
 				<ul role="menu" class="action-menu" data-hx-push-url="false" data-hx-swap="beforeend">
 					<li role="presentation">
 						<a role="menuitem" href="{{ companyURI "/profile" }}" data-hx-boost="true">
-							<i class="ri-account-circle-line"></i>
+							<i class="ri-user-6-line"></i>
 							{{( pgettext "Account" "menu" )}}
 						</a>
 					</li>