Improve `find` call in Readme's example Makefile.
Improve `find` call in Readme's example Makefile.

Now finds all `.jade` files in any subdirectory of `pages` too.
This is an improvement because template directories are often deep.

angryrobot/jade,pugjs/jade,pugjs/pug,martindale/jade,omixen/jade,webmasteraxe/jade,mrotaru/jade,cutsin/jade,webskyer/jade,Laoujin/jade,colin-h/jade,ceremcem/jade,nyakto/jade-async,rajnishyadav321/jade,derbyparty/derby-jade,jodytate/jade,cgvarela/jade,jadejs/then-jade,tranhieutt/jade,harp/jade,mumaoxi/jade,cesarmarinhorj/jade,mumaoxi/jade,angryrobot/jade,VANITAX/jade,martindale/jade,Laoujin/jade,magicdawn/jade,slang800/yade,Mitrend/jade,gexiaowei/jade,Shinchy/jade,fredyteheranto/jade,timmfin/jade,jadejs/then-jade,webskyer/jade,VeraWei/jade,colin-h/jade,bogus34/jade-vfs,jodytate/jade,flintinatux/jade,magicdawn/jade,cgvarela/jade,fredyteheranto/jade,ddopson/jade-coffeescript,VANITAX/jade,Victorgichohi/jade,derbyparty/derby-jade,bogus34/jade-vfs,ridixcr/jade,pugjs/pug,jirengu/jade,omixen/jade,muthhus/jade,harp/jade,gexiaowei/jade,rajnishyadav321/jade,coderhaoxin/jade,hnag409/jade,ddopson/jade-coffeescript,gdibble/jade,angrilove/jade,modulexcite/jade,illusionfield/jade,jirengu/jade,cesarmarinhorj/jade,hnag409/jade,mrotaru/jade,illusionfield/jade,ilovezy/jade,ilovezy/jade,tranhieutt/jade,jjz/jade,modulexcite/jade,andreytkachenko/jade,VeraWei/jade,pugjs/then-jade,Mitrend/jade,ridixcr/jade,gdibble/jade,cutsin/jade,Victorgichohi/jade,jjz/jade,nyakto/jade-async,coderhaoxin/jade,Shinchy/jade,pugjs/then-jade,angrilove/jade,webmasteraxe/jade,andreytkachenko/jade,pugjs/jade,muthhus/jade