Several Dashboard improvements

[l0ll098]

Hi, this PR aims at improving the dashboard project by:

• making the "editor" component fill the entire screen. This is particularly useful if you have long config files
• hiding vertical scrollbars that were shown when switching between tabs (for example in the "Configuration" section)
• changing component icons with some icons from the Material Design icon set. Previous icons were not coherent with the rest of the application and, being pngs, they were not able to scale in resolution
• fixing the blurry bold labels throughout the entire application
• adding a new message in the "Overview" page that gets shown if user has no running applications. He/She will be greeted with a message that directs the user to the documentation website, where he/she can learn how to start an application
• fixing an issue with the "info" popup that showed an incorrect Dapr Dashboard version

Here you can see a screenshot of the new component icons:

This is the new message in the Overview page

In case you have any questions/suggestions/doubts (or whatever), feel free to ping me :)

[codecov[bot]]

Codecov Report

Merging #190 (59ddab3) into master (cf26836) will decrease coverage by 0.10%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
- Coverage   15.57%   15.47%   -0.11%     
==========================================
  Files           7        7              
  Lines         443      446       +3     
==========================================
  Hits           69       69              
- Misses        368      371       +3     
  Partials        6        6              

Impacted Files	Coverage Δ
pkg/instances/instances.go	14.82% <0.00%> (-0.18%)	:arrow_down:

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[yaron2]

That's a great PR! Thanks for this contribution. Will review soon.