Fix scroll positions

[Koki-Yamaguchi]

• Scroll to the top when a user goes to a game page.
• Scroll to the previously stayed positions (saved position) when going back to the previous page.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 1721f19):

https://carcassonne-c28b5--pr50-fix-scroll-0l1o81fu.web.app

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