Remove page scroll animation when switching between bottom navigation items

[hjiangsu]

Pull Request Description

This PR removes the page animation that occurs when switching between the feed, search, account, inbox, and setting pages. There are a few reasons why I opted to remove this page animation:

• When switching between pages, there's no obvious way to remove the visual glitch mentioned in Buggy navigation bar animation #1257. The underlying issue is that the scroll animation loads each page briefly, so the behaviour that the bottom nav bar experiences is correct (since we're actually navigating through those pages)
• Because the animation technically loads each page as it scrolls through them, the logic within each page also gets briefly triggered. This means that if I navigate from the feed to the settings page, each page in between will be loaded (and the logic for each page will be triggered). As a side effect, this causes some additional network requests even when they're not required.
• The animation technically does not meet MD3 guidelines. This is not a large issue, but it would be nice to match those guidelines whenever possible

For those reasons mentioned above, I think it would be best to remove this animation. Thoughts on this change @micahmo?

Issue Being Fixed

Issue Number: #1257

Screenshots / Recordings

Checklist

• Did you update CHANGELOG.md?
• Did you use localized strings where applicable?
• Did you add semanticLabels where applicable for accessibility?

[micahmo]

I totally agree! This seems to follow the pattern that most apps with a bottom nav bar use.