fix SEO stuff

output/favicon/about.txt

@@ -0,0 +1,6 @@
+This favicon was generated using the following font:
+
+- Font Title: Leckerli One
+- Font Author: Copyright (c) 2011 Gesine Todt (www.gesine-todt.de hallo@gesine-todt.de), with Reserved Font Names "Leckerli"
+- Font Source: https://fonts.gstatic.com/s/leckerlione/v20/V8mCoQH8VCsNttEnxnGQ-1itLZxcBtItFw.ttf
+- Font License: SIL Open Font License, 1.1 (http://scripts.sil.org/OFL))

output/favicon/site.webmanifest

@@ -0,0 +1 @@
+{"name":"","short_name":"","icons":[{"src":"/android-chrome-192x192.png","sizes":"192x192","type":"image/png"},{"src":"/android-chrome-512x512.png","sizes":"512x512","type":"image/png"}],"theme_color":"#ffffff","background_color":"#ffffff","display":"standalone"}