feat: Restore jump nav and content width [backport from master]

[Lunyachek]

This is backport from master #994

Our proposal is to modify the width values of jump-nav and content to their state prior to this pull request - #784. In this pull request, the width of the jump nav was reduced, and the width of the content was increased. This results in the jump nav appearing very narrow on themes with a maximum container width. Even the phrase "Account Information" does not fit into a single line

After this small fix we'll restore previous state of the columns width, like in Palm

[openedx-webhooks]

Thanks for the pull request, @Lunyachek!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                      Coverage Diff                      @@
##             open-release/quince.master     #995   +/-   ##
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  Coverage                              ?   46.61%           
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  Files                                 ?      116           
  Lines                                 ?     2407           
  Branches                              ?      640           
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  Hits                                  ?     1122           
  Misses                                ?     1211           
  Partials                              ?       74           

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[mphilbrick211]

All set, along with the master, @openedx/2u-aperture!

[mphilbrick211]

Hi @openedx/2u-vanguards! This backport is ready for when the master is all set.

[mphilbrick211]

@openedx/2u-infinity flagging for review. Thanks!