fix: decoration of see all children link in wiki pages

[ihor-romaniuk]

Description

This pull request contains small recommendations for fixing the styling of the "See all children" link and replacing the decorative separator from the HTML markup with a style one.

Related Pull Requests

PR to the open-release/quince.master branch: #33669
PR to the master branch: #33670

Screenshots/sandbox (optional):

Before	After

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[mariajgrimaldi]

Hi there, @ihor-romaniuk; since there will not be another Palm release according to the Open edX release schedule, so I'll close this PR in the name of BTR. If it's not already there, you can open a backport PR to the Quince branch to include these changes in the next release or wait until Redwood. Thanks!

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