fix: trim long text in links in the social networks block

[ihor-romaniuk]

Description

This pull request contains minor fixes for when a user pastes a very long link into the social media links field.
In this case, the links break the page and add horizontal scrolling.

Screenshot before

Screenshot after

Related Pull Requests

PR to the master branch: #916

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (open-release/palm.master@03e3b67). Click here to learn what that means.

Additional details and impacted files

@@                     Coverage Diff                     @@
##             open-release/palm.master     #915   +/-   ##
===========================================================
  Coverage                            ?   38.65%           
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  Files                               ?      110           
  Lines                               ?     2287           
  Branches                            ?      623           
===========================================================
  Hits                                ?      884           
  Misses                              ?     1318           
  Partials                            ?       85           

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[mphilbrick211]

Hi @openedx/fed-bom! Would someone be able to please review / merge this for us (once the Master is merged)? Thanks!

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@ihor-romaniuk 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.