Add the gistLink handlebars helper

Signed-off-by: Henrique Vicente <henriquevicente@gmail.com>
Add the copy-paste library

Signed-off-by: Henrique Vicente <henriquevicente@gmail.com>
Add the Gists cmd with the browser, create, fork, and delete options

Signed-off-by: Henrique Vicente <henriquevicente@gmail.com>
Fix doc typo

Signed-off-by: Henrique Vicente <henriquevicente@gmail.com>