fix: updated URL to get high quality Pokémon images

[BhanuVikram]

Hi Brad,

My name is Bhanu Vikram. I am one of your students in the 50 Projects In 50 Days course. I noticed an issue in line number 50 of this file: https://github.com/bradtraversy/50projects50days/blob/master/pokedex/script.js. The Pokémon images were missing or low quality. I have fixed the issue with a different URL.

Because of Prettier, you will see numerous changes, but the only change I have made is on line number 50. I have not made any other changes to your code.

I have changed this link:

<img src="https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/${pokemon.id}.png"" alt="${name}">

to:

<img src="https://assets.pokemon.com/assets/cms2/img/pokedex/full/${id}.png" alt="${name}">

This is my first ever contribution, and I hope that you will accept this PR.

Kind regards,
Bhanu

Bhanu Vikram