fix: edu resource multimedia and gallery templates

[stephiescastle]

Checklist

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Description

Addresses QA feedback for:

• https://github.com/nasa-jpl/www/issues/441#issuecomment-2322200346
• https://github.com/nasa-jpl/www/issues/442
• https://github.com/nasa-jpl/www/issues/443
• https://github.com/nasa-jpl/www/issues/444
• https://github.com/nasa-jpl/www/issues/445
• https://github.com/nasa-jpl/www/issues/378

Additional notes:

• also includes fixes for richtext media in BlockText (originally marked as low priority in https://github.com/nasa-jpl/www/issues/494)

Instructions to test

1. make vue-storybook
2. View the page templates:

• http://localhost:6006/?path=/story/templates-edu-pageedugallerydetail--base-story&globals=theme:ThemeEdu
• http://localhost:6006/?path=/story/templates-edu-pageedumultimediadetail--base-story&globals=theme:ThemeEdu

Tested in the following environments/browsers:

Operating System

• macOS
• iOS
• iPadOS
• Windows

Browser

• Chrome
• Firefox ESR
• Firefox
• Safari
• Edge