adjust favicon to proper size, tweak image on main site and some other tweaks

hugo.toml

@@ -10,7 +10,7 @@ footerHtml = 'Este blog es posible gracias al poder de <a href="https://www.debi
   [params.author]
     name = "Peter Domínguez"
     avatar = "/simon.png"
-    avatarSize = "size-m"
+    avatarSize = "size-xl"
     email = "correo@peterdominguez.art"
   [params.styles]
     color = "red"
@@ -56,7 +56,7 @@ aria = "Mi correo electrónico"
     weight = 2
     url = "/autor"
   [[menu.header]]
-    name = "código fuente"
+    name = "código-fuente"
     weight = 3
     url = "https://gitlab.com/putridpete/hugo-website"
   [[menu.header]]