Update ann-datatype and ann-protocol syntax
core.typed: Notes on protocols and datatypes
Add mentions about ClojureTV, podcasts to Community page.
Merge branch 'master' into podcasts
Merge pull request #97 from gsnewmark/podcasts

Links to ClojureTV YouTube channel, podcasts about Clojure
Remove blip.tv link
Remove company-specific podcast
Stop recommending clojure.org for documentation

The whole reason why CDS exists is because clojure.org docs are
hopelessly expert-oriented and only a few people can contribute
to it.