AO3-4283 make HTML and classes on the Marked for Later module consistent

[slavalamp]

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Issue

https://otwarchive.atlassian.net/browse/AO3-4283

Purpose

Makes HTML tag and classes of the Marked for Later module on the homepage consistent with the ones on the History and Marked for Later pages

Testing Instructions

1. Have a work marked for later
2. Create and use a site skin that attempts to target history blurbs, e.g.: ol.reading .blurb { background: pink; }
3. The Marked for Later blurbs on the homepage should have pink backgrounds

References

n/a

Credit

slavalamp (they/them)

same name on Jira

[sarken]

Hi, slavalamp!

Thank you so much for this pull request. It looks good to me, so I've marked it approved!

I've also given your account permission to comment on, assign, and transition issues in the future. I've also assigned the relevant Jira issue to you and set its status to In Review, so no need to do that.

Thanks again for contributing! If you have any questions, you can contact us at [email protected].