docs: Fix URLs in examples sites with path prefix
docs: Fix URLs in examples sites with path prefix

When baseurl ist something like "http://example.com/hugo/" a link to
"/tags/..." does not work. Therefore I fixed the examples so that they
also work in cases where the website is not saved at the server's root.
See also https://discuss.gohugo.io/t/how-shall-i-link-a-taxonomy-page/3920

anthonyfok/hugo,digitalcraftsman/hugo,jygastaud/hugo,gohugoio/hugo,Zenithar/hugo,MarkDBlackwell/hugo,mdhender/hugo,mitchchn/hugo,bogem/hugo,tubo028/hugo,mayah/hugo,mdhender/hugo,fedelibre/hugo,digitalcraftsman/hugo,gohugoio/hugo,mayah/hugo,tubo028/hugo,anthonyfok/hugo,mdhender/hugo,mdhender/hugo,anthonyfok/hugo,gohugoio/hugo,jygastaud/hugo,fedelibre/hugo,fedelibre/hugo,MarkDBlackwell/hugo,Zenithar/hugo,bogem/hugo,mitchchn/hugo,fedelibre/hugo