promote 0.2.1-alpha2 to 0.2.1;

consolidate :did-mount-gup and :did-update-gup into just :gup;

- added `:enter-int` to the gup-hash-map;

add warning when using top-level :prepare-dataset;

fix broken demo; move resources to dev-resources;

rename main-container to rid3-main-container;

create alpha version;