fix: use /assets/ prefix for public paths

ref: https://github.com/go-gitea/gitea/pull/15219
Signed-off-by: Muthu Kumar <muthukumar@thefeathers.in>

templates/custom/header.tmpl

@@ -1,4 +1,4 @@
-<link rel="stylesheet" href="/custom.css" />
+<link rel="stylesheet" href="/assets/custom.css" />
 <link rel="preconnect" href="https://fonts.gstatic.com">
 <link href="https://fonts.googleapis.com/css2?family=Inter:wght@100;200;300;400;500;600;700;800;900&display=swap" rel="stylesheet"> 
 <link href="https://fonts.googleapis.com/css2?family=Roboto+Mono:ital@0;1&display=swap" rel="stylesheet"> 

templates/home.tmpl

@@ -2,7 +2,7 @@
 <div class="page-content home">
 	<div class="sixteen wide center aligned centered column hero-flex">
 		<div>
-			<img class="logo" width="100" height="100" src="/img/logo.svg"/>
+			<img class="logo" width="100" height="100" src="/assets/img/logo.svg"/>
 		</div>
 		<div class="hero">
 			<h1 class="ui icon header title">