Opposite direction arrow button for Omnibar

[Craig-Rosario]

Closes #10240

Opposite direction arrow button for Omnibar:

1. Add's new arrow in HTML, CSS, and JS with functionality.
2. Avoid clipping of the first element due to the arrows.
3. Renamed arrows to "nav-arrow-left" and "nav-arrow-right" to avoid confusion in the future.

Technical

Testing

1)Go to any book page (eg. https://openlibrary.org/works/OL69166W/Italian_journeys)
2)Resize the screen and see the arrow only for one direction

Screenshot/Video

Video of implementation:

new.arrow.mp4

Screenshot:

Stakeholders

@cdrini

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 17.57%. Comparing base (3025f5d) to head (cbc8b8f).
Report is 141 commits behind head on master.

Files with missing lines	Patch %	Lines
...ns/openlibrary/js/edition-nav-bar/EditionNavBar.js	0.00%	6 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10315      +/-   ##
==========================================
+ Coverage   17.44%   17.57%   +0.12%     
==========================================
  Files          89       88       -1     
  Lines        4792     4775      -17     
  Branches      848      849       +1     
==========================================
+ Hits          836      839       +3     
+ Misses       3436     3415      -21     
- Partials      520      521       +1     

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[cdrini]

Nice, great work @Craig-Rosario ! Tested on testing and works like a charm!

As an improvement for a future issue: we should only show the left arrow if we're not at the far-left. Similarly, the right arrow should also disappear if we're at the end.

[Craig-Rosario]

Thanks @cdrini,
Regarding the arrow to disappear if it on one of the far-ends, it's a great thing to add!
I think I can make that feature, I'll open a new issue for it.