fixes from feedback on edu events and news listing pages

[stephiescastle]

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Description

Address the following feedback:

• https://github.com/nasa-jpl/www/issues/272#issuecomment-2322339587
• https://github.com/nasa-jpl/www/issues/273#issuecomment-2322348964

Instructions to test

A lot of the changes pair with corresponding changes to www, but you can test visual changes to BlockLinkCard in storybook (line clamping, placement of date, line separating items).

1. make vue-storybook
2. View http://localhost:6006/?path=/story/components-cards-searchresultcards--edu-event-card&globals=theme:ThemeEdu

Tested in the following environments/browsers:

Operating System

• macOS
• iOS
• iPadOS
• Windows

Browser

• Chrome
• Firefox ESR
• Firefox
• Safari
• Edge