app: v2.0.1

What's Changed

• Make GradeId const. by @Jonas-Sander in #1527
• Bump app version to v2.0.1 by @nilsreichardt in #1534
• Change Id.id to Id.value. by @Jonas-Sander in #1550
• Add buying Sharezone Plus for child via Plus Page on website. by @Jonas-Sander in #1522
• Add padding to the Sharezone Plus sales page on the website by @nilsreichardt in #1557
• Enable homework due date chips for stable track by @nilsreichardt in #1556

Full Changelog: app-v2.0.0...app-v2.0.1