Update docsy version up to v0.4.0

Docsy update v0.3.0 => v0.4.0

go.mod

@@ -2,4 +2,4 @@ module github.com/tektoncd/website
 
 go 1.18
 
-require github.com/google/docsy v0.3.0 // indirect
+require github.com/google/docsy v0.4.0 // indirect

go.sum

 github.com/FortAwesome/Font-Awesome v0.0.0-20210804190922-7d3d774145ac/go.mod h1:IUgezN/MFpCDIlFezw3L8j83oeiIuYoj28Miwr/KUYo=
 github.com/google/docsy v0.3.0 h1:wR0e0xJ6qIj/RPq2AP1Ufm44BCak9Sl72H2BWNAc/JA=
 github.com/google/docsy v0.3.0/go.mod h1:opkofZo7WlNw+/pjrHSC2nAHJHQ6Xnms9vtL/htBvds=
+github.com/google/docsy v0.4.0 h1:Eyt2aiDC1fnw/Qq/9xnIqUU5n5Yyk4c8gX3nBDdTv/4=
+github.com/google/docsy v0.4.0/go.mod h1:vJjGkHNaw9bO42gpFTWwAUzHZWZEVlK46Kx7ikY5c7Y=
 github.com/google/docsy/dependencies v0.3.0/go.mod h1:2zZxHF+2qvkyXhLZtsbnqMotxMukJXLaf8fAZER48oo=
+github.com/google/docsy/dependencies v0.4.0/go.mod h1:2zZxHF+2qvkyXhLZtsbnqMotxMukJXLaf8fAZER48oo=
 github.com/twbs/bootstrap v4.6.1+incompatible/go.mod h1:fZTSrkpSf0/HkL0IIJzvVspTt1r9zuf7XlZau8kpcY0=