[#43] dashboard skeleton

[brucecaii]

• refactor sidebar, chat interface for dashboard
• moved progress bar to sidebar (component communication)
• fixed tooltip bug
• dashboard styling and data binding, just need to integrate with new API
• auto toggling when chatting (hide sidebar in chat)
• integrate vue-chart for data visualization

dashboard behaviour when click on toggle button:

1. when no prediction is made, show sidebar
2. when the first prediction is made, show dashboard
3. when user say yes to answer more questions (between two predictions), show sidebar

TODO: integration, unit test

[brucecaii]

Major work is in sidebar.vue, it is hidden in the changes you need to click on load diff

[codecov[bot]]

Codecov Report

Merging #386 into master will decrease coverage by 0.02%. The diff coverage is 39.47%.

@@            Coverage Diff             @@
##           master     #386      +/-   ##
==========================================
- Coverage   68.17%   68.14%   -0.03%     
==========================================
  Files          51       53       +2     
  Lines        2099     2119      +20     
  Branches       17       19       +2     
==========================================
+ Hits         1431     1444      +13     
- Misses        663      671       +8     
+ Partials        5        4       -1

Impacted Files	Coverage Δ
src/web_client/src/components/EventBus.js	100% <100%> (ø)
src/web_client/src/components/Sidebar.vue	43.24% <16%> (-56.76%)	:arrow_down:
src/web_client/src/components/Dashboard.vue	66.66% <66.66%> (ø)
src/web_client/src/components/Chat.vue	92.85% <88.88%> (+19.1%)	:arrow_up:

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