feat(ui): #321 Add right sidebar transition

[oneminch]

Contributor checklist

• This pull request is on a separate branch and not the main branch

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Description

According to #321, the right sidebar for mobile that houses the theme and language selectors doesn't have a transition when toggled. I have added a transition similar to the left sidebar component.

Related issue

• Right sidebar transition #321

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[github-actions]

Thank you for the pull request!

The activist team will do our best to address your contribution as soon as we can. The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

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[andrewtavis]

Thanks for the work here, @oneminch! I'll do some minor edits to get the width of the sidebar back to what it was, but this is great stuff! 😊

[oneminch]

No problem. Can't wait to contribute more.