Update abstract sources UI

[shinyichen]

Update UI for abstract full text and other sources :

• In desktop, it is moved to the left side, and is always visible while navigating within the article

• In mobile, it is unchanged

[codecov]

Codecov Report

Attention: Patch coverage is 53.58255% with 149 lines in your changes are missing coverage. Please review.

Project coverage is 47.4%. Comparing base (bd67d7c) to head (86c84f9).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #467     +/-   ##
========================================
- Coverage    47.5%   47.4%   -0.1%     
========================================
  Files         409     413      +4     
  Lines       41858   41970    +112     
  Branches      599     596      -3     
========================================
- Hits        19857   19856      -1     
- Misses      21990   22103    +113     
  Partials       11      11             

Files	Coverage Δ
src/components/icons/GenericFileIcon.tsx	66.7% <66.7%> (ø)
src/components/icons/HtmlFileIcon.tsx	66.7% <66.7%> (ø)
src/components/icons/PdfFileIcon.tsx	60.0% <60.0%> (ø)
src/components/Layout/AbsLayout.tsx	25.0% <27.3%> (-1.6%)	⬇️
src/components/AbstractSources/AbstractSources.tsx	65.6% <54.8%> (-10.4%)	⬇️
...components/AbstractSources/AbstractSourceItems.tsx	52.5% <52.5%> (ø)

... and 1 file with indirect coverage changes

[thostetler]

I'm not sure how I feel about this menu pushing the navigation down, but it does work to make it more prominent on the page. If Kelly is cool with this then I'm good too.

[shinyichen]

I'm not sure how I feel about this menu pushing the navigation down, but it does work to make it more prominent on the page. If Kelly is cool with this then I'm good too.

I feel the same, but Alberto came up with it, and it might be better than the other designs.