Major rendering/performance improvements

• phetch now has a home on gopher: gopher://phkt.io/1/phetch
• New releases can be downloaded over gopher as well: gopher://phkt.io/1/releases/phetch
• ctrl-c no longer quits the app. Use q for that.
• ⚡ phetch will now perform a lot smoother on lower powered machines like Raspberry Pis or under WSL on a smaller Windows machine thanks to the work in #6. Screen flicker has been removed and responsiveness has been increased.

There will be new rendering and display bugs that have crept in. Please report any you see.

Thank you and please enjoy!