Feat swagger

[imsergiy]

PR checklist

Please tick all of the below (if a certain item is not required for this PR please tick the box anyway)

Docs

• [x] If you added new code; is it self documenting? (all the variable names clear, comments added where appropriate)
• [x] If you touched existing code; did you refactor existing naming, added comments where necessary?

Tests

• [x] If your ticket adds new functionality; have you added unit tests to verify behaviour?
• [ ] If your ticket alters user interaction with the UI; have you added integration tests?
• [ ] Do your tests check for every convievable user behabviour? (all behaviours the user can perform)

Typing

• [x] If you added new code; have you added typing?
• [x] If you touched existing code; have you improved its typing?

Styling

• [ ] If new styles were created; Did you refactor/add more styles in css-in-js style?
• [ ] Are all fonts, sizes, colours, margins, paddings in line with designs?
• [ ] Did you perform a visual comparison of the implementation with the designs?

This PR does the following:

• cleans up and refactors imports
• code splitting with import()
• restructure how "apps" are rendered and where things like redux are introduced
• new scripts for starting/building apps: npm run <APP_NAME> <SCRIPT> (ex: npm run dashboard build)
• build-small script (no source maps)
• fix for URL parsing (supports both normal and hash-based routing)

[codecov[bot]]

Codecov Report

Merging #348 (b3c46eb) into master (fd2fbaf) will increase coverage by 0.29%. The diff coverage is 66.27%.

@@            Coverage Diff             @@
##           master     #348      +/-   ##
==========================================
+ Coverage   67.79%   68.08%   +0.29%     
==========================================
  Files          65       66       +1     
  Lines        1512     1523      +11     
  Branches      235      234       -1     
==========================================
+ Hits         1025     1037      +12     
+ Misses        487      486       -1     

Impacted Files	Coverage Δ
src/apps/Dashboard.tsx	0.00% <0.00%> (ø)
src/apps/Hub.tsx	0.00% <0.00%> (ø)
src/apps/Styleguide.tsx	0.00% <0.00%> (ø)
src/apps/Swagger.tsx	0.00% <ø> (ø)
src/apps/utils.ts	0.00% <0.00%> (ø)
src/index.tsx	0.00% <0.00%> (ø)
src/routes/Dashboard.tsx	0.00% <ø> (ø)
src/routes/Hub.tsx	0.00% <ø> (ø)
src/routes/Swagger.tsx	0.00% <ø> (ø)
src/redux/flows/flows.selectors.ts	72.72% <50.00%> (ø)
... and 5 more

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[pswu11]

@imsergiy could you

• make sure the README snippet work under the debugging tool (see Han's message in slack)
• resolve the failing checks above

Thanks!