fix: refactor filters for easier maintenance

[douglowder]

📝 Why & how

• Refactor the code in components/Filters to avoid hardcoding filter params in index.tsx
• More clearly distinguish between platforms and other filters
• Clearly distinguish and group filters that require main search path

[Simek]

Thanks for those improvements! 👍

Will follow up with statuses display tweaks, so we no longer list Expo Go along side supported platforms.