add theme-color to documentation-layout
<html>
<head>
<meta charset="utf-8"/>
- <meta name="viewport" content="width=device-width, initial-scale=1">
+ <meta name="viewport" content="width=device-width, initial-scale=1"/>
+ <meta name="theme-color" content="#ffaff3" media="(prefers-color-scheme: light)"/>
+ <meta name="theme-color" content="#33354d" media="(prefers-color-scheme: dark)"/>
<title>{{ page_title }}</title>
<link rel="stylesheet" href="{{ unnest }}/index.css?v={{ gleam_version }}" type="text/css"/>
<!-- The docs_config.js file is provided by HexDocs and shared
