Onboarding and other improvements

🧳 We improved our onboarding experience! We're preparing to launch Pincone on ProductHunt this week, so we're hopeful we'll be able to bring Pincone into the hands of more people. This was the perfect time to improve our onboarding experience. We've also added email verification to prevent spam accounts.

📱 Around half of our visitors engage with Pincone from their phones, which is why we decided to make some small, but vital improvements to what Pincone looks like on smaller devices.