Update header.html partial to use new .IsHome check
Update header.html partial to use new .IsHome check

@bep added the new `{{ .IsHome }}` check, so I went ahead and updated
brew and Hugo, then this page. Thanks @bep!

Fixes #4

Hideaki1/eSolia,eSolia/eSolia,Hideaki1/eSolia,eSolia/eSolia,Hideaki1/eSolia,eSolia/eSolia