AO3-7500 Update donation page and add new donation link to footer and site map

[JSLarson]

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Issue

https://otwarchive.atlassian.net/browse/AO3-7500

Purpose

Updates the donation page as per the Jira ticket. Formatting looks a bit strange but I'm not entirely used to the style guide and I copied everything exactly.

Credit

James Larson (he/she)
Jira account should have the same name.

[Bilka2]

Hi, James Larson!

Thank you so much for this pull request. Someone will be along to review it soon.

In the meantime, we've updated the Jira issue status to In Review so no one mistakenly creates a duplicate pull request. If you'd like the ability to comment on, assign, and transition issues in the future, you're welcome to create a Jira account! It makes things a bit easier for us on the organizational side if the Full Name on your Jira account either closely matches the name you'd like us to credit in the release notes or includes it in parentheses, e.g. "Nickname (CREDIT NAME)."

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[JSLarson]

Some tests didn't pass at first, they should be good now.

[JSLarson]

Probably should have sent a screenshot with the original PR. Oh well.

[brianjaustin]

Thank you! A few comments, mostly around our internationalization guidelines