Changed typography on changelog to dark mode

[isabensusan]

Description

Added prose-invert to the changelog body component to make typography dark mode, and removed previous hacky attempts at making text white.

Related Tickets & Documents

closes #256

Mobile & Desktop Screenshots/Recordings

Before: Very subtle, but there's links in the text that the user can't see because they are black by default.

After: links and text are visible because of default dark mode theme

Steps to QA

1. Go to https://opensauced.pizza/changelog
2. Open any changelog item and notice the text is fully readable now

Tier (staff will fill in)

• [ ] Tier 1
• [ ] Tier 2
• [ ] Tier 3
• [ X] Tier 4

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[nickytonline]

There's some errors related to eslint. See https://app.netlify.com/sites/opensauced-landing/deploys/6630576edf5afe0008bc9070#L101-L634

[bdougie]

There's some errors related to eslint. See https://app.netlify.com/sites/opensauced-landing/deploys/6630576edf5afe0008bc9070#L101-L634

I looked into this and it was unrelated to this PR. Need to add aria tags to an img

https://github.com/open-sauced/landing-page/pull/257