Resolve #66 : Add noindex to 404.html

Signed-off-by: GitHub Action <action@github.com>

README.md

@@ -90,7 +90,12 @@ Use [RealFaviconGenerator](https://realfavicongenerator.net/) to generate these
 * safari-pinned-tab.svg
 * site.webmanifest
 
-If your favicon source is in the svg format, save it as `assets/images/favicon.svg` to enable svg favicon for supported browsers.
+#### SVG Favicons
+
+If your favicon is in SVG format, there are two ways to implement the same in this theme.
+
+* If you are looking for a clean directory structure, place your favicon as `favicon.svg` in `static` directory. **In this mode, favicon will not be minified by Hugo**
+* If you want your generated site to be as light as possible, place your favicon as `favicon.svg` in `assets/images`. **In this mode, favicon will be minified by Hugo**
 
 ### Social icons
 

layouts/partials/site-meta.html

@@ -2,12 +2,16 @@
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <meta http-equiv="X-UA-Compatible" content="ie=edge">
+{{- if (not (in .Page.RelPermalink "404")) -}}
 <meta name="robots" content="index, follow">
 <meta name="revisit-after" content="15 days">
+{{- else -}}
+<meta name="robots" content="noindex, nofollow, noarchive">
+{{- end -}}
 <link rel="author" href="{{"humans.txt" | relURL}}">
 <link rel="apple-touch-icon" sizes="180x180" href="{{"apple-touch-icon.png" | relURL}}">
 {{- if (fileExists "static/favicon.ico") -}}
-<link rel="icon" href="{{"favicon.ico" | relURL}}" type="image/x-icon" sizes="48x48">
+<link rel="icon" href="{{"favicon.ico" | relURL}}" type="image/x-icon">
 {{- end -}}
 {{ $favicon := "images/favicon.svg" }}
 {{- if (fileExists (printf "assets/%s" $favicon)) -}}