[ICON REQUEST]: itch.io

### I have searched through the issues and didn't find my problem.

- [x] Confirm

### About the icon

itch.io is a very popular site for game devs and coders

### Links and sources

I use devicons all the time, as it is easy to link my socials on nearly every website. I would love to see [itch.io](https://itch.io/) featured on here at some point, since many game devs and coders upload their games there.

All variations and their color pallet are available in their [press kit](https://itch.io/press-kit). The one I linked below is the black no-text icon but it would be cool to also have their crimson red version of this (which is what most web browsers display).

### Icon links and previews

#### itchio-textless-black.svg

### Additional information

Here's a screenshot of their palette, according to the [press kit](https://itch.io/press-kit).

- #fa5c5c
- #222222
- #434343
- #858585

The issue provides itchio-textless-black.svg and links the itch.io press kit as source material; begin by reviewing how existing brand icons are added to this repository. Done means itch.io is represented with the requested black textless icon and its crimson-red variant, using the listed palette.

Written by the indexing model from the issue text.