Add help system with IntroJS#188

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sisi-huang wants to merge 8 commits intomasterfrom

Commits on Aug 5, 2019

add introjs into shiny
sisi-huang
committed

Commits on Aug 8, 2019

Commits on Aug 12, 2019

update get_started messages
sisi-huang
committed

Commits on Aug 20, 2019

update the intro descriptions
sisi-huang
committed

Commits on Aug 21, 2019

move tutorial button to top right
Markus Konrad
committed
better position for tutorial step 3
Markus Konrad
committed

Commits on Oct 21, 2019

Merge branch 'master' into issue_144
sisi-huang
authored