Add website for binrw

[jam1garner]

For a while I've wanted this, but haven't made an issue until now as I want to have it ready by 0.9.0's release.

Things needed:

• [x] landing page
• [x] showcase section
• [ ] blog(?) (might just keep binrw-related blog posts on jam1.re, unsure)
• [x] tutorial section
• [x] github/discord/matrix links

The site will be a static site generated using zola. I'll likely use github pages+actions for hosting/deployment.

[jam1garner]

https://binrw.rs/

https://github.com/jam1garner/binrw-site