Redo favicon stuff

See https://medium.com/swlh/are-you-using-svg-favicons-yet-a-guide-for-modern-browsers-836a6aace3df

config.yaml

@@ -4,8 +4,6 @@ markup:
     lineNos: true
 
 params:
-  faviconICO: favicon.ico
-  faviconPNG: favicon.png
   readingtime: true
 
 taxonomies:

exampleSite/config.yaml

@@ -20,9 +20,9 @@ params:
   # these are for the OpenGraph/Twitter embeds in Hugo
   description: Example website for bobatheme
 
-  # these are for favicons in bobatheme (defaults are shown here)
-  # faviconICO: favicon.ico
-  # faviconPNG: favicon.png
+  # these are for favicons in bobatheme (disabled by default)
+  # faviconSVG: favicon.svg
+  # appleTouchPNG: apple-touch-icon.png
 
   # show reading time (enabled by default)
   # readingtime: true

layouts/partials/head.html

@@ -16,11 +16,11 @@
         <script defer src="{{ .Permalink }}" type="text/javascript" integrity="{{ .Data.Integrity }}" crossorigin="anonymous"></script>
     {{ end }}
 
-    {{ with .Site.Params.faviconICO }}
-        <link rel="icon" type="image/x-icon" href="{{ . | absURL }}" />
+    {{ with .Site.Params.faviconSVG }}
+        <link rel="icon" href="{{ . | absURL }}" />
     {{ end }}
-    {{ with .Site.Params.faviconPNG }}
-        <link rel="icon" type="image/png" href="{{ . | absURL }}" />
+    {{ with .Site.Params.appleTouchPNG }}
+        <link rel="apple-touch-icon" href="{{ . | absURL }}" />
     {{ end }}
 
     {{ if .IsHome }}