v0.3.0 - Colorful sankeys, preview pages, and error messages, oh my!

What's Changed

• Redo homepage by @lnovitz in #329
• display email processing progress on process page by @jediela in #330
• Redo homepage by @lnovitz in #332
• fix dashboard by @jediela in #324
• remove playground by @lnovitz in #339
• Nadia/backend/email filter 2 by @nlahlborg in #335
• refactor hompage to use heroui components by @jediela in #343
• Add route protection by @jediela in #322
• 321 feat display user flow via playground on homepage by @jediela in #331
• Added Sankey Diagram Export by @kevinlambchops in #336
• enlarge logo text and add bottom border to navbar by @jediela in #348
• fetch email data from last timestamp by @jempio in #337
• [chore]: Refactor dashboard to use component by @lnovitz in #345
• Fix/168 error messaging scope change by @lnovitz in #344

Full Changelog: v0.2.0...v0.3.0