UI Features and linting

[skeptrunedev]

I did more than @Nutlope explicitly asked for in https://github.com/Nutlope/news-summarizer/pull/1, but none of these are breaking changes and I think that they all add value.

However, if there are objections to any of them, please request changes and I will edit the PR. Thanks!

• [x] Makes API request on paste
• [x] Makes API request on enter
• [x] Errors in all appropriate places
• [x] Stops loading on error
• [x] Put generateSummary into a callback: just a performance optimization and best practice
• [x] Add linting: knowing that beginners will hopefully fork this repo or use it as reference, I think it's very important to add linting. There were warnings in the dependencies arrays in the [...slug].tsx file that linting picked up in the current version of main.
• [x] Add prettier: The prettier-plugin-tailwindcss was already installed. However, without including it in a config file, some VIM and VSCode configurations won't pick it up. Imo, having it explicitly referenced in the config is best practice.

https://user-images.githubusercontent.com/15804464/217460593-f1f15aa4-7cb7-48f7-a750-4555590798bf.mp4

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