refactor(head): remove favicon output

It's better to use favicon generator tools, and paste HTML in head/custom.html

exampleSite/config.toml

@@ -12,7 +12,6 @@ DefaultContentLanguage = "en"                   # Theme i18n support
     
 [params]
     mainSections = ["post"]
-    favicon = ""
     featuredImageField = "image"
     [params.dateFormat]
         published = "Jan 02, 2006"

layouts/partials/head.html

@@ -14,11 +14,5 @@
         <link rel="{{ .Rel }}" type="{{ .MediaType.Type }}" href="{{ .Permalink | safeURL }}">
     {{- end -}}
     
-    {{- if .Site.Params.favicon -}}
-        {{- $logo := resources.Get .Site.Params.favicon -}}
-        {{- $favicon := $logo.Resize "32x" -}}
-        <link rel="icon" type="image/png" href="{{ $favicon.RelPermalink }}" />
-    {{- end -}}
-
     {{- partial "head/custom.html" . -}}
 </head>